Register multiple WordPress menu's, see http://codex.wordpress.org/Function_Reference/register_nav_menus. Here I use my own function since the parent theme, Toolset Bootstrap, is not using a filter for this.

functions.php

// Register multiple WordPress menu's, see https://gist.github.com/Willem-Siebe/40311753fce4bfb5fd62.

function wsis_register_nav_menus() {
    register_nav_menus(array(
        'support_navigation' => 'Support Navigation',
        'shop_navigation' => 'Shop Navigation',
        'social_navigation' => 'Social Navigation',
        'footer_navigation' => 'Footer Navigation',
  )); }

add_action('after_setup_theme', 'wsis_register_nav_menus');