أعط أجوبة - English

Companies have their branches in other cities. The school that I work at has their offices in the main building where pupils study for "A-levels". There is also another building in a different part of the city, where pupils learn in vocational schools. In a way they are two different schools with separate councils but they are grouped together and have a one headmaster and a joined council as well.  If I want to say that I worked at the vocational subdivision, how should I reffer to it? for example:

I worked at the Vocational (College) branch of Wilford College in the northern dictrict.