For vocational school students, the days of vocational school are usually known at the start of the year. Instead of creating numerous individual entries manually, you can use recurring entries to generate multiple absence entries at once. The feature also allows you to exclude school holidays.
For example, you can create vocational school entries for every Tuesday and Thursday from January to June, while automatically accounting for school holidays in a specific federal state.
Detailed instructions for creating a recurring entry can be found in the documentation on absence entries — recurring entries.
Screenshot: Enter vocational school as a recurring entry
Note: Vocational school (Berufsschule) as described here refers to the German dual vocational training system. The school holiday exclusion feature references school holiday calendars by German federal state (Bundesland). Equivalent workflows may apply in other countries with similar vocational training systems.