Hopefully this will make sense --

I'm creating a number of buildings in a street scene; for each new building, so that I can concentrate on that one object, I'm going file>new scene, creating the building (just a few boxes really), then exporting it into my main street 'scene'

thing is I'm ending up with a load of 'scenes' in the project directory - is there a better system for creating objects for a scene, without them being 'scenes' in their own right? :S

I've thought of layers, but wondered if it's more efficient to keep my modelling and final 'scenes' separate..