Split cart packages based on product category. PluginHive Plugins : https://www.pluginhive.com/plugins/

functions.php

/**
 * Split cart packages based on product category.
 * Created at : 17 Dec 2018
 * Updated at : 19 Dec 2018
 * PluginHive Plugins : https://www.pluginhive.com/plugins/
 */
add_filter( 'woocommerce_cart_shipping_packages', 'wf_split_cart_by_shipping_class_group' );

function wf_split_cart_by_shipping_class_group($package){
   //Reset packages
	$packages               = array();
   //Init splitted package
   $splitted_packages      =  array();
   // Group of category ids
   $category_groups  =  array(
        'cat1' =>  array(18),  //category name => category ids
        );
	// group items by shipping classes
	foreach ( WC()->cart->get_cart() as $item_key => $item ) {
		if ( $item['data']->needs_shipping() ) {
	 		$belongs_to_category =  'others';     // name if not in any group
	        $terms_post = get_the_terms( $item['product_id'] , 'product_cat' );
			foreach ($terms_post as $term_cat) { 
			    $term_cat_id = $term_cat->term_id; 
			    foreach($category_groups as $class_group_key => $class_group){
	                if(in_array($term_cat_id, $class_group)){           
	                    $belongs_to_category =  $class_group_key;
	                    break;
	                }
	          	}
			}     
	       	$splitted_packages[$belongs_to_category][$item_key]   =  $item;
	    }
	}
    // Add grouped items as packages
         if(is_array($splitted_packages)){
      foreach($splitted_packages as $key => $splitted_package_items){
         $packages[] = array(
            'contents'        => $splitted_package_items,
            'package_name'	  => $key,
            'contents_cost'   => array_sum( wp_list_pluck( $splitted_package_items, 'line_total' ) ),
            'applied_coupons' => WC()->cart->get_applied_coupons(),
            'user'            => array(
                'ID' => get_current_user_id(),
            ),
            'destination'    => array(
               'country'    => WC()->customer->get_shipping_country(),
               'state'      => WC()->customer->get_shipping_state(),
               'postcode'   => WC()->customer->get_shipping_postcode(),
               'city'       => WC()->customer->get_shipping_city(),
               'address'    => WC()->customer->get_shipping_address(),
               'address_2'  => WC()->customer->get_shipping_address_2()
            )
         );
      }
      $package=$packages;
   }

   return $package;

}

add_filter( 'woocommerce_shipping_package_name','package_name', 10, 3 );
function package_name( $package_name, $iteration, $package ) {
	if(isset($package['package_name']))
	{
		$package_name=$package['package_name'];
		$product_names=array();
		if ( count( $package ) > 1 ) {
			foreach ( $package['contents'] as $item_id => $values ) {
				$product_names[ $item_id ] = $values['data']->get_name() . ' ×' . $values['quantity'];
			}
		}
		foreach ($package as $key => $value) {
			
		}
		unset($package['package_name']);
   		return $package_name.'<br>'.implode( ', ', $product_names );
	}
    return $package_name;
}