You can delete an appointment type only if an appointment of this type has never been booked.
If you want to remove an appointment type after it has been booked, so that it can’t be booked again, you can deactivate it.
Delete an appointment type
To delete an appointment type:
Open the App Drawer then click View All > Setup > Services > Appointments.
Click the appointment type you want to delete.
Click Delete Appointment. This button will only appear if this appointment type has never been booked.
If the appointment type has been booked before, deactivate the appointment type instead.
When the confirmation message is displayed, review the message, and then click OK.