How to Hide Bookingor Admin Menus

function plt_hide_bookingor_menus() {
	//Hide "Bookingor".
	remove_menu_page('bookingor');
	//Hide "Bookingor → Dashboard".
	remove_submenu_page('bookingor', 'bookingor');
	//Hide "Bookingor → Business Profile".
	remove_submenu_page('bookingor', 'bookingor-profile');
	//Hide "Bookingor → Calendar".
	remove_submenu_page('bookingor', 'bookingor-calendar');
	//Hide "Bookingor → Bookings".
	remove_submenu_page('bookingor', 'bookingor-appointment');
	//Hide "Bookingor → Category".
	remove_submenu_page('bookingor', 'bookingor-category');
	//Hide "Bookingor → Services".
	remove_submenu_page('bookingor', 'bookingor-services');
	//Hide "Bookingor → Locations".
	remove_submenu_page('bookingor', 'bookingor-location');
	//Hide "Bookingor → Staff".
	remove_submenu_page('bookingor', 'bookingor-staff');
	//Hide "Bookingor → Customer".
	remove_submenu_page('bookingor', 'bookingor-customer');
	//Hide "Bookingor → Payment".
	remove_submenu_page('bookingor', 'bookingor-payment');
	//Hide "Bookingor → Notifications".
	remove_submenu_page('bookingor', 'bookingor-notification');
	//Hide "Bookingor → Settings".
	remove_submenu_page('bookingor', 'bookingor-settings');
	//Hide "Bookingor → Style Templates".
	remove_submenu_page('bookingor', 'bookingor-design');
}

add_action('admin_menu', 'plt_hide_bookingor_menus', 11);
Where do I put this code?