Department and technician

Department and technician

In a configuration like this:
      Site 1
            Department 11
            Department 12
            ...
      Site 2
            Department 21
      Site 3
            Department 31

there is a way to configure specific technician for department? I need a person that could see and manage only request from his department.
At this point i could only see a workaround like this:
      Site 11
            Department 11
      Site 12
            Department 12
etc
but i don't really like it.
Any suggestion?

Thanks in advance

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