"Enlarged sections"

Is there an easy way to do an enlarged section of a drawing (as is often done on maps where they pull out ‘insets’ sections)? I don’t think I can do a ‘live’ blow up (so that any changes in one are immediately reflected in the other).

The only thing that comes quickly to mind is to use an ArtBoard around the desired area, export the Artboard as an SVG, then import the SVG and enlarge as necessary.

Anyone got any other ideas?

I can show a graphic example but thought I would start here.