$args->menu sage code example
Example: how to add a second navigation to a sage them
register_nav_menus( array(
'primary_navigation' => __('Primary Navigation', 'sage'),
'about_navigation' => __('About Navigation', 'sage'),
'company_navigation' => __('Company Navigation', 'sage'),
'shop_navigation' => __('Shop Navigation', 'sage'),
'social_navigation' => __('Social Navigation', 'sage'),
) );