When I collect objects into, say, a drawing of a bicycle, I can do this with grouping or by creating a block (and I don't know what else). If one of the objects in the bicycle collection is itself a collection of objects--for example, a "front wheel" made up of tire, wheel frame, and spokes objects--what "grouping" method do I use such that when I explode the bicycle it only explodes the first level of objects--the objects that made up the bicycle become separate objects, but the objects that make up the front wheel stay collected as a "front wheel." (Or, is there a less deep form of explode?) Blocking the most detailed objects seems burdensome.
You'd need to have embedded blocks. Make blocks of your sub-entities like wheels, frame, handlebars, whatever. Then assemble them and make a new blocks called Bike and select all of those other blocks.
Matt Kolberg Cansel - Autodesk Division http://www.cansel.ca/