If you want to regularly enter setup times in the schedule for which employees are present but not available for customer bookings, use events.
Creating events in the schedule
Click on the desired day in the schedule overview and create the event. If you repeat this for all days of a shift, you can save it and transfer it to the future.
Event in the calendar
Events are displayed in the calendar. This way, colleagues can also see that the corresponding employee cannot accept appointments during this time.
Count event time as working time
If your event times should be counted as working times in reports and statistics when they fall outside regular working hours, you must ensure that you have activated this function in the schedule settings.

