At the end of a school year Untis offers many possibilities to process many functions for the creation of a new school year automatically. Needless to say that you can use these functions with MultiUser as well. As in the single user version go to "File | New school year" and first define the dates of the begin and the end of the school year to come.
After a click on <OK>, a dialogue appears in which you can define in which school year and version of the database the data shall be transferred.

By default Untis suggests as the new school year the dates that are entered in the dialogue "New school year". If this school year does not exist in the database yet then it will be created.