manipulate.js

jQuery(document).ready(function($) {
  var $menu_item = jQuery(".menu-products-taxonomy > ul > li");
  for (var i = 0; i < $menu_item.length; i += 7) {
    var $div = $("<div/>", {
      class: 'col-md-6'
    });
    $menu_item.slice(i, i + 7).wrapAll($div);
  }
});

menu.html

<div class="menu-products-taxonomy"><ul class="footer_links_menu-products-taxonomy total-items-14 parent-items-0 single-items-0"><li class="menu-2530 depth-1 total-children-10 parent-children-0 single-children-10  first"><a class="fs-root-link" title="Superwool® Fibre" href="/products/superwoolr-fibre">Superwool&reg; Fibre</a><ul class="footer_links_menu-products-taxonomy total-items-10 parent-items-0 single-items-0"><li class="menu-2531 depth-1 fs-no-children  first"><a title="Blanket" href="/products/superwoolr-fibre/blanket">Blanket</a></li>
<li class="menu-2532 depth-1 fs-no-children"><a title="Bulk" href="/products/superwoolr-fibre/bulk">Bulk</a></li>
<li class="menu-2533 depth-1 fs-no-children"><a title="Modules &amp; Blok Products" href="/products/superwoolr-fibre/modules-blok-products">Modules &amp; Blok Products</a></li>
<li class="menu-2534 depth-1 fs-no-children"><a title="Board products" href="/products/superwoolr-fibre/board-products">Board products</a></li>
<li class="menu-2535 depth-1 fs-no-children"><a title="Vacuum Formed" href="/products/superwoolr-fibre/vacuum-formed">Vacuum Formed</a></li>
<li class="menu-2538 depth-1 fs-no-children"><a title="Mastic" href="/products/superwoolr-fibre/mastic">Mastic</a></li>
<li class="menu-2539 depth-1 fs-no-children"><a title="Paper" href="/products/superwoolr-fibre/paper">Paper</a></li>
<li class="menu-2540 depth-1 fs-no-children"><a title="Felt" href="/products/superwoolr-fibre/felt">Felt</a></li>
<li class="menu-2541 depth-1 fs-no-children"><a title="Logs" href="/products/superwoolr-fibre/logs">Logs</a></li>
<li class="menu-2542 depth-1 fs-no-children  last"><a title="Textiles" href="/products/superwoolr-fibre/textiles">Textiles</a></li>
</ul></li>
<li class="menu-2543 depth-1 total-children-9 parent-children-0 single-children-9"><a class="fs-root-link" title="Refractory Ceramic Fibre (RCF)" href="/products/refractory-ceramic-fibre-rcf">Refractory Ceramic Fibre (RCF)</a><ul class="footer_links_menu-products-taxonomy total-items-9 parent-items-0 single-items-0"><li class="menu-2544 depth-1 fs-no-children  first"><a title="Blanket" href="/products/refractory-ceramic-fibre-rcf/blanket">Blanket</a></li>
<li class="menu-2545 depth-1 fs-no-children"><a title="Bulk" href="/products/refractory-ceramic-fibre-rcf/bulk">Bulk</a></li>
<li class="menu-2546 depth-1 fs-no-children"><a title="Modules &amp; Blok Products" href="/products/refractory-ceramic-fibre-rcf/modules-blok-products">Modules &amp; Blok Products</a></li>
<li class="menu-2547 depth-1 fs-no-children"><a title="Board Products" href="/products/refractory-ceramic-fibre-rcf/board-products">Board Products</a></li>
<li class="menu-2549 depth-1 fs-no-children"><a title="Vacuum Formed" href="/products/refractory-ceramic-fibre-rcf/vacuum-formed">Vacuum Formed</a></li>
<li class="menu-2551 depth-1 fs-no-children"><a title="Kaowool Paper" href="/products/refractory-ceramic-fibre-rcf/kaowool-paper">Kaowool Paper</a></li>
<li class="menu-2552 depth-1 fs-no-children"><a title="Felt" href="/products/refractory-ceramic-fibre-rcf/felt">Felt</a></li>
<li class="menu-2553 depth-1 fs-no-children"><a title="Logs" href="/products/refractory-ceramic-fibre-rcf/logs">Logs</a></li>
<li class="menu-2554 depth-1 fs-no-children  last"><a title="Textiles" href="/products/refractory-ceramic-fibre-rcf/textiles">Textiles</a></li>
</ul></li>
<li class="menu-2555 depth-1 total-children-2 parent-children-0 single-children-2"><a class="fs-root-link" title="Solgel Fibre" href="/products/solgel-fibre">Solgel Fibre</a><ul class="footer_links_menu-products-taxonomy total-items-2 parent-items-0 single-items-0"><li class="menu-2556 depth-1 fs-no-children  first"><a title="Shapes" href="/products/solgel-fibre/shapes">Shapes</a></li>
<li class="menu-2557 depth-1 fs-no-children  last"><a title="Boards" href="/products/solgel-fibre/boards">Boards</a></li>
</ul></li>
<li class="menu-2558 depth-1 total-children-13 parent-children-0 single-children-13"><a class="fs-root-link" title="Fired Refractory Shapes" href="/products/fired-refractory-shapes">Fired Refractory Shapes</a><ul class="footer_links_menu-products-taxonomy total-items-13 parent-items-0 single-items-0"><li class="menu-2559 depth-1 fs-no-children  first"><a title="Crucibles" href="/products/fired-refractory-shapes/crucibles">Crucibles</a></li>
<li class="menu-2560 depth-1 fs-no-children"><a title="Tundishes" href="/products/fired-refractory-shapes/tundishes">Tundishes</a></li>
<li class="menu-2561 depth-1 fs-no-children"><a title="Launders" href="/products/fired-refractory-shapes/launders">Launders</a></li>
<li class="menu-2562 depth-1 fs-no-children"><a title="Distribution Boxes" href="/products/fired-refractory-shapes/distribution-boxes">Distribution Boxes</a></li>
<li class="menu-2563 depth-1 fs-no-children"><a title="Pouring Nozzles" href="/products/fired-refractory-shapes/pouring-nozzles">Pouring Nozzles</a></li>
<li class="menu-2564 depth-1 fs-no-children"><a title="Atomizing Nozzles" href="/products/fired-refractory-shapes/atomizing-nozzles">Atomizing Nozzles</a></li>
<li class="menu-2565 depth-1 fs-no-children"><a title="Furnace Spouts" href="/products/fired-refractory-shapes/furnace-spouts">Furnace Spouts</a></li>
<li class="menu-2566 depth-1 fs-no-children"><a title="Saggars" href="/products/fired-refractory-shapes/saggars">Saggars</a></li>
<li class="menu-2567 depth-1 fs-no-children"><a title="Trays" href="/products/fired-refractory-shapes/trays">Trays</a></li>
<li class="menu-2568 depth-1 fs-no-children"><a title="Metamics" href="/products/fired-refractory-shapes/metamics">Metamics</a></li>
<li class="menu-2569 depth-1 fs-no-children"><a title="Kiln Furniture" href="/products/fired-refractory-shapes/kiln-furniture">Kiln Furniture</a></li>
<li class="menu-2570 depth-1 fs-no-children"><a title="Glass Feeder Expandables" href="/products/fired-refractory-shapes/glass-feeder-expandables">Glass Feeder Expandables</a></li>
<li class="menu-2571 depth-1 fs-no-children  last"><a title="Plungers/Stopper Rods" href="/products/fired-refractory-shapes/plungersstopper-rods">Plungers/Stopper Rods</a></li>
</ul></li>
<li class="menu-2572 depth-1 fs-no-children"><a class="fs-root-link" title="Furnaces &amp; Fire Assayware" href="/products/furnaces-fire-assayware">Furnaces &amp; Fire Assayware</a></li>
<li class="menu-2573 depth-1 total-children-4 parent-children-0 single-children-4"><a class="fs-root-link" title="Heat Shields" href="/products/heat-shields">Heat Shields</a><ul class="footer_links_menu-products-taxonomy total-items-4 parent-items-0 single-items-0"><li class="menu-2574 depth-1 fs-no-children  first"><a title="Shell Tech" href="/products/heat-shields/shell-tech">Shell Tech</a></li>
<li class="menu-2575 depth-1 fs-no-children"><a title="Integrated Tech" href="/products/heat-shields/integrated-tech">Integrated Tech</a></li>
<li class="menu-2576 depth-1 fs-no-children"><a title="Flexible Tech" href="/products/heat-shields/flexible-tech">Flexible Tech</a></li>
<li class="menu-2577 depth-1 fs-no-children  last"><a title="Rigid Box Tech" href="/products/heat-shields/rigid-box-tech">Rigid Box Tech</a></li>
</ul></li>
<li class="menu-2578 depth-1 fs-no-children"><a class="fs-root-link" title="Fire Protection" href="/products/fire-protection">Fire Protection</a></li>
<li class="menu-2579 depth-1 total-children-4 parent-children-0 single-children-4"><a class="fs-root-link" title="Microporous Insulation" href="/products/microporous-insulation">Microporous Insulation</a><ul class="footer_links_menu-products-taxonomy total-items-4 parent-items-0 single-items-0"><li class="menu-2580 depth-1 fs-no-children  first"><a title="Insulation Board" href="/products/microporous-insulation/insulation-board">Insulation Board</a></li>
<li class="menu-2581 depth-1 fs-no-children"><a title="Flexible Insulation" href="/products/microporous-insulation/flexible-insulation">Flexible Insulation</a></li>
<li class="menu-2582 depth-1 fs-no-children"><a title="Insulation Panel" href="/products/microporous-insulation/insulation-panel">Insulation Panel</a></li>
<li class="menu-2583 depth-1 fs-no-children  last"><a title="Ladle Liner" href="/products/microporous-insulation/ladle-liner">Ladle Liner</a></li>
</ul></li>
<li class="menu-2584 depth-1 fs-no-children"><a class="fs-root-link" title="Mortar Cement Mastics" href="/products/mortar-cement-mastics">Mortar Cement Mastics</a></li>
<li class="menu-2585 depth-1 total-children-3 parent-children-0 single-children-3"><a class="fs-root-link" title="Structural Insulation" href="/products/structural-insulation">Structural Insulation</a><ul class="footer_links_menu-products-taxonomy total-items-3 parent-items-0 single-items-0"><li class="menu-2586 depth-1 fs-no-children  first"><a title="Roofing insulation" href="/products/structural-insulation/roofing-insulation">Roofing insulation</a></li>
<li class="menu-2587 depth-1 fs-no-children"><a title="Flooring insulation" href="/products/structural-insulation/flooring-insulation">Flooring insulation</a></li>
<li class="menu-2588 depth-1 fs-no-children  last"><a title="Sustainable insulation" href="/products/structural-insulation/sustainable-insulation">Sustainable insulation</a></li>
</ul></li>
<li class="menu-2589 depth-1 total-children-1 parent-children-0 single-children-1"><a class="fs-root-link" title="Insulating Fire Bricks (IFB)" href="/products/insulating-fire-bricks-ifb">Insulating Fire Bricks (IFB)</a><ul class="footer_links_menu-products-taxonomy total-items-1 parent-items-0 single-items-0"><li class="menu-2590 depth-1 fs-no-children  first  last"><a title="Insulating Firebrick Global Product Range" href="/products/insulating-fire-bricks-ifb/insulating-firebrick-global-product-range">Insulating Firebrick Global Product Range</a></li>
</ul></li>
<li class="menu-2591 depth-1 total-children-2 parent-children-0 single-children-2"><a class="fs-root-link" title="Silicon Carbide" href="/products/silicon-carbide">Silicon Carbide</a><ul class="footer_links_menu-products-taxonomy total-items-2 parent-items-0 single-items-0"><li class="menu-2592 depth-1 fs-no-children  first"><a title="Halsic" href="/products/silicon-carbide/halsic">Halsic</a></li>
<li class="menu-2593 depth-1 fs-no-children  last"><a title="Clay bonded" href="/products/silicon-carbide/clay-bonded">Clay bonded</a></li>
</ul></li>
<li class="menu-2594 depth-1 total-children-10 parent-children-0 single-children-10"><a class="fs-root-link" title="Monolithic Ceramics Production" href="/products/monolithic-ceramics-production">Monolithic Ceramics Production</a><ul class="footer_links_menu-products-taxonomy total-items-10 parent-items-0 single-items-0"><li class="menu-2595 depth-1 fs-no-children  first"><a title="Dense" href="/products/monolithic-ceramics-production/dense">Dense</a></li>
<li class="menu-2596 depth-1 fs-no-children"><a title="Insulating" href="/products/monolithic-ceramics-production/insulating">Insulating</a></li>
<li class="menu-2597 depth-1 fs-no-children"><a title="Low Cement" href="/products/monolithic-ceramics-production/low-cement">Low Cement</a></li>
<li class="menu-2598 depth-1 fs-no-children"><a title="Medium Cement" href="/products/monolithic-ceramics-production/medium-cement">Medium Cement</a></li>
<li class="menu-2599 depth-1 fs-no-children"><a title="Clay Bonded" href="/products/monolithic-ceramics-production/clay-bonded">Clay Bonded</a></li>
<li class="menu-2600 depth-1 fs-no-children"><a title="Aluminium Resistant" href="/products/monolithic-ceramics-production/aluminium-resistant">Aluminium Resistant</a></li>
<li class="menu-2601 depth-1 fs-no-children"><a title="Phosphate Bonded" href="/products/monolithic-ceramics-production/phosphate-bonded">Phosphate Bonded</a></li>
<li class="menu-2602 depth-1 fs-no-children"><a title="Dry Vibratory" href="/products/monolithic-ceramics-production/dry-vibratory">Dry Vibratory</a></li>
<li class="menu-2603 depth-1 fs-no-children"><a title="Cements &amp; Mortars" href="/products/monolithic-ceramics-production/cements-mortars">Cements &amp; Mortars</a></li>
<li class="menu-2604 depth-1 fs-no-children  last"><a title="Special Duty Grades" href="/products/monolithic-ceramics-production/special-duty-grades">Special Duty Grades</a></li>
</ul></li>
<li class="menu-2605 depth-1 total-children-3 parent-children-0 single-children-3  last"><a class="fs-root-link" title="Kiln Furniture" href="/products/kiln-furniture">Kiln Furniture</a><ul class="footer_links_menu-products-taxonomy total-items-3 parent-items-0 single-items-0"><li class="menu-2606 depth-1 fs-no-children  first"><a title="Tubes" href="/products/kiln-furniture/tubes">Tubes</a></li>
<li class="menu-2607 depth-1 fs-no-children"><a title="Rollers" href="/products/kiln-furniture/rollers">Rollers</a></li>
<li class="menu-2608 depth-1 fs-no-children  last"><a title="Fused silica rollers" href="/products/kiln-furniture/fused-silica-rollers">Fused silica rollers</a></li>
</ul></li>
</ul></div>