function plt_hide_groupon_master_menus() {
//Hide the "Coupon Master" menu.
remove_menu_page('groupon-master');
//Hide the "Coupon Master → Coupon Master" menu.
remove_submenu_page('groupon-master', 'groupon-master');
//Hide the "Coupon Master → Add-ons" menu.
remove_submenu_page('groupon-master', 'groupon-master-admin-addons');
}
add_action('admin_menu', 'plt_hide_groupon_master_menus', 11);