What does a 'Super' do on an Interface?

Within System Analysis, it’s possible to assign a ‘Super’ to a bunch of interfaces, e.g. 10 interfaces can get the same Super.

I expected it would group and combine all interfaces from A-to-B into one to get a simpler, higher level IDB. Yet when I import it into an IDB diagram, the exchange items and links don’t seem to come with it.

What does the Super do? How should it be used?