How do I check out two appointments for two separate clients at once?

You are not able to check out two appointments at once. If a client wants to pay for their appointment and another client's appointment in a single transaction, you can follow these steps:

1. Start the checkout process for Client A's appointment.
2. In the Cash Register, select Add Product. Create a "product" named and priced for the service Client B will receive.
3. Finish the checkout process for Client A. 
4. Start the checkout process for Client B's appointment. 
5. Discount the total down to $0. If you'd like, you can enter a discount note explaining how the appointment was paid for. 
6. Finish the checkout process for Client B.