How to Hide the "Booking Engine" Admin Menu

function plt_hide_cultbooking_booking_engine_menus() {
	//Hide the "Booking Engine" menu.
	remove_menu_page('cultbooking-booking-engine');
}

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

Where do I put this code?