A service category/subcategory is said to be a buddy category of another service category/subcategory if they both have common service segments that can be combined into a single segment when scheduled back-to-back.
Buddy categories allow the Appointment Book to identify services with identical segments so that, when booked together, it can automatically shorten their total duration by combining the identical segments into one.
Learn about reducing the duration of multiple services
When you book back-to-back services, the Appointment Book checks if the latter service is a buddy category of the former and if the services have any common segments that can be combined into one. If so, it combines the common segments into a single segment, thus reducing the total duration of the appointment and making the associated service provider available for other appointments.
For example, in the case of a haircut and hair color, if you define blow-dry as a finishing time segment for both the services and if you make hair color a buddy category of hair cut, the Appointment Book automatically combines the identical (finishing time) segments and shortens the total duration. Thus, making the associated service provider available for other appointments.
Important: The buddy category association is directional. As in, if haircut is assigned as the buddy category of hair color, it does not mean that hair color is a buddy category of haircut. So, to book a reduced duration of an appointment for haircut and hair color, haircut must be the first service in the appointment.