How to Hide BirchPress Scheduler Admin Menus

function plt_hide_birchschedule_menus() {
	//Hide "Appointments".
	remove_menu_page('edit.php?post_type=birs_appointment');
	//Hide "Appointments → Calendar".
	remove_submenu_page('edit.php?post_type=birs_appointment', 'birchschedule_calendar');
	//Hide "Appointments → New Appointment".
	remove_submenu_page('edit.php?post_type=birs_appointment', 'post-new.php?post_type=birs_appointment');
	//Hide "Appointments → Locations".
	remove_submenu_page('edit.php?post_type=birs_appointment', 'edit.php?post_type=birs_location');
	//Hide "Appointments → Providers".
	remove_submenu_page('edit.php?post_type=birs_appointment', 'edit.php?post_type=birs_staff');
	//Hide "Appointments → Services".
	remove_submenu_page('edit.php?post_type=birs_appointment', 'edit.php?post_type=birs_service');
	//Hide "Appointments → Settings".
	remove_submenu_page('edit.php?post_type=birs_appointment', 'birchschedule_settings');
	//Hide "Appointments → Help".
	remove_submenu_page('edit.php?post_type=birs_appointment', 'birchschedule_help');

	//Hide "Clients".
	remove_menu_page('edit.php?post_type=birs_client');
	//Hide "Clients → Clients".
	remove_submenu_page('edit.php?post_type=birs_client', 'edit.php?post_type=birs_client');
	//Hide "Clients → Add New Client".
	remove_submenu_page('edit.php?post_type=birs_client', 'post-new.php?post_type=birs_client');
}

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