Different menu

different-menu.php

add_filter('tc_menu_args', 'my_menus');
function my_menus($args){
    $page_menu = array(
        //page_id => menu_id
        '19' => '14',
        '2' => '2'
    );
    if ( is_page() && array_key_exists(tc__f('__ID'), $page_menu)  )
        $args['menu'] = $page_menu[tc__f('__ID')];
    return $args;
}

I found this on my search on the forums, but I just want to know how to actually use it. (I understand how to get my num for my menus)

I would like most of my main pages to have a sub-menu for what is in that section. I want to use a side bar on those pages to show that menu.

I like the way the widget for customizer pro works for custom menu, but it makes that menu global for the entire site. Here is what I want, but I want a different menu on each page that needs one. http://www.wordpress.robbinsbuilders.com/about-us/

I think I understand the different-menu.php code will help identify the menu, but how to I apply it to the side bar?

Thanks.