How to add sub menu classes on wordpress theme development

this my code and it add my primary-menu to WordPress so what I have to do that sub append to this menu

 <?PHP
            $default = array(
                'container' => false,
                'theme_location' => 'primary-menu',
                'menu_class' => 'nav navbar-nav navbar-right'
                );
                wp_nav_menu($default);`enter code here`

            ?>

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