TT2,
FYI
I have recently signed up in a new forum that you may find of some interest in your modeling quest...
http://www.eng-tips.com

I have received answers to my own questions concerning the move to inventor from AutoCAD
Do a search for the software you are using, & I'll bet, someone will be able to point you in the right direction on your questions

The key I find is asking the question in the area/forum that will most likely get the correct answer

Take care,
HO-229