We had implemented UCS server for testing purpose.
While configuring folder / file sharing permission I want everyone can access the folder or file but they will not able to open any file in department folders.
As far as I know there is no graphical interface for ACLs in UCS.
You can either use the commandline tools getfacl and setfacl or try to set the permissions by using a Windows client (given that you are using Samba 4).
I dont believe that there will be a tool provided by Univention. In case you have a graphical enviromment on the server or can use X-Forwarding you can have a look at Eiciel which is available from the unmaintained repository in UCS. (untested)