You can quickly record extra uses against a membership. This might be useful if a customer brings a friend along and you want to deduct a session from the their class pack, or they have used credit for classes that weren't timetabled.
Note. This option is only available for class pack/fixed length memberships. It is not available for recurring memberships.
Go do the customer's membership tab and locate the membership you want to record an extra usage for.
Click "Record Extra Usage" and enter the number of uses to remove as well as any notes.