How to Hide After Product Protection Plan Admin Menus

function plt_hide_afterinc_app_menus() {
	//Hide the "After Plans" menu.
	remove_menu_page('After Plans');
	//Hide the "After Plans → Settings" menu.
	remove_submenu_page('After Plans', 'After Plans');
	//Hide the "After Plans → Bulk Product Update" menu.
	remove_submenu_page('After Plans', 'Bulk-Product-Update');
}

add_action('admin_menu', 'plt_hide_afterinc_app_menus', 11);

Where do I put this code?