It's going to be neither as easy nor as flexible as you'd like, I'm afraid. Parametric left the building with Solidworks. While you can save features and apply them to new geometry very easily, it is a manual process, not automatic. You'd select your size, (drawing) from a database, Apply the saved Feature, (Door_1, Door_2, etc.), and then select the geometry for each part of the Feature. (It's faster than it sounds, especially with practice.) You can have shortcuts, such as color-coded drawings to make the various geometries of the Features very quick and easy to select, for instance.
The Nesting in BobCAD is something I need to explore. I got it in the latest package, but have yet to really use it. My initial impression is that it's got a pretty narrowly defined workflow, so getting in step with that flow will be critical.
Luke
"All I'm trying to find out is the fellow's name on first base" -- Lou Costello