How to Hide Booking Ultra Pro CORE Admin Menus

function plt_hide_booking_ultra_pro_menus() {
	//Hide "Booking Ultra".
	remove_menu_page('bookingultra');
	//Hide "Booking Ultra → Booking Ultra".
	remove_submenu_page('bookingultra', 'bookingultra');
	//Hide "Booking Ultra → Services".
	remove_submenu_page('bookingultra', 'bookingultra-services');
	//Hide "Booking Ultra → Staff".
	remove_submenu_page('bookingultra', 'bookingultra-users');
	//Hide "Booking Ultra → Appointments".
	remove_submenu_page('bookingultra', 'bookingultra-appointments');
	//Hide "Booking Ultra → Payments".
	remove_submenu_page('bookingultra', 'bookingultra-orders');
	//Hide "Booking Ultra → Custom Fields".
	remove_submenu_page('bookingultra', 'bookingultra-fields');
	//Hide "Booking Ultra → Settings".
	remove_submenu_page('bookingultra', 'bookingultra-settings');
	//Hide "Booking Ultra → Notifications".
	remove_submenu_page('bookingultra', 'bookingultra-mail');
	//Hide "Booking Ultra → Payment Gateways".
	remove_submenu_page('bookingultra', 'bookingultra-gateway');
	//Hide "Booking Ultra → Documentation".
	remove_submenu_page('bookingultra', 'bookingultra-help');
	//Hide "Booking Ultra → Licensing".
	remove_submenu_page('bookingultra', 'bookingultra-licence');
	//Hide "Booking Ultra → Maintenance".
	remove_submenu_page('bookingultra', 'bup-maintenance');
	//Hide "Booking Ultra → Upgrade  ➜".
	remove_submenu_page('bookingultra', 'bookingultra-upgrade');
}

add_action('admin_menu', 'plt_hide_booking_ultra_pro_menus', 12);
Where do I put this code?