The most popular Booking Methods are created in the system by default. However, if any Booking Method is missing you can always add it by yourself. 

1. Open Property Settings / General / Booking Methods:

2. Click on Add button. Then in Edit Booking Method window add the name of the booking method and a logo (it is optional). When it is done Save and Close the changes. 

3. The new Booking Method will appear on the list. Finally, Save and Close the Property Settings window.

Your new booking method will be visible also on the list in Reservation Details so that you could select it for a reservation: