How to Hide Appointment Booking Calendar Admin Menus

function plt_hide_appointment_booking_calendar_menus() {
	//Hide "Settings → Appointment Booking Calendar".
	remove_submenu_page('options-general.php', 'cpabc_appointments.php');

	//Hide "Appointment Booking Calendar".
	remove_menu_page('cpabc_appointments.php');
	//Hide "Appointment Booking Calendar → Appointment Booking Calendar".
	remove_submenu_page('cpabc_appointments.php', 'cpabc_appointments.php');
	//Hide "Appointment Booking Calendar → Manage Calendars".
	remove_submenu_page('cpabc_appointments.php', 'cpabc_appointments');
	//Hide "Appointment Booking Calendar → Help: Online demo".
	remove_submenu_page('cpabc_appointments.php', 'cpabc_appointments_demo');
	//Hide "Appointment Booking Calendar → I Need Help".
	remove_submenu_page('cpabc_appointments.php', 'cpabc_appointments_support');
	//Hide "Appointment Booking Calendar → Upgrade".
	remove_submenu_page('cpabc_appointments.php', 'cpabc_appointments_upgrade');
}

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

Where do I put this code?