Click Appointments > Services > Create > Service
Set the max number of customers.
Set the price, and consider whether the price is per customer (or not -- in this case, it should be much higher).
Lastly, consider if the service needs multiple teachers and if you want this to be a requirement.
Save when done and assign the service to the Appointment Boards it applies to.
Click Boards > then select a board.
Then click Services > Assign Service.
