You may divide your institutions in campuses to manage situations such as extension schools. A campus is not just another building down the road, it is rather a fairly independent extension of your institution with its own academic terms and classes.
Suppose your institution is based in Washington DC and has an extension school in Miami FL, you may want to create 2 campuses: "Washington Campus" and "Miami Campus". You can then assign a term to a specific campus (for example "Spring W-2018" as your Spring 2018 in Washington and "Spring M-2018" as your Spring 2018 in Miami.) When you then create classes under each term, each class is naturally connected to the campus of their term. You may also link Rooms, Lists, Graduations, Admissions and Employees to a campus. Many reports lets you filter by campus the information you print.
To define campuses go to Setup -> Campuses
Click on the lower right to add a new campus, or click on an existing campus to edit it.
Fields are self-explanatory.
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