How to Hide Pinpoint Booking System Admin Menus

function plt_hide_booking_system_menus() {
	//Hide "Pinpoint Booking System".
	remove_menu_page('dopbsp');
	//Hide "Pinpoint Booking System → Dashboard".
	remove_submenu_page('dopbsp', 'dopbsp');
	//Hide "Pinpoint Booking System → Calendars".
	remove_submenu_page('dopbsp', 'dopbsp-calendars');
	//Hide "Pinpoint Booking System → Locations".
	remove_submenu_page('dopbsp', 'dopbsp-locations');
	//Hide "Pinpoint Booking System → Search only in PRO".
	remove_submenu_page('dopbsp', 'dopbsp-pro');
	//Hide "Pinpoint Booking System → Reservations".
	remove_submenu_page('dopbsp', 'dopbsp-reservations');
	//Hide "Pinpoint Booking System → Rules".
	remove_submenu_page('dopbsp', 'dopbsp-rules');
	//Hide "Pinpoint Booking System → Extras".
	remove_submenu_page('dopbsp', 'dopbsp-extras');
	//Hide "Pinpoint Booking System → Discounts".
	remove_submenu_page('dopbsp', 'dopbsp-discounts');
	//Hide "Pinpoint Booking System → Taxes & fees".
	remove_submenu_page('dopbsp', 'dopbsp-fees');
	//Hide "Pinpoint Booking System → Coupons".
	remove_submenu_page('dopbsp', 'dopbsp-coupons');
	//Hide "Pinpoint Booking System → Forms".
	remove_submenu_page('dopbsp', 'dopbsp-forms');
	//Hide "Pinpoint Booking System → Email templates".
	remove_submenu_page('dopbsp', 'dopbsp-emails');
	//Hide "Pinpoint Booking System → SMS templates".
	remove_submenu_page('dopbsp', 'dopbsp-smses');
	//Hide "Pinpoint Booking System → Translation".
	remove_submenu_page('dopbsp', 'dopbsp-translation');
	//Hide "Pinpoint Booking System → Settings".
	remove_submenu_page('dopbsp', 'dopbsp-settings');
	//Hide "Pinpoint Booking System → Tools".
	remove_submenu_page('dopbsp', 'dopbsp-tools');
}

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