Does anybody know why the bottom work plane provided in the Structural Truss rfa is the plane that adjust when the height parameter is changed? How would I make it so the Top work plane adjust and the bottoms stays in place. Does it matter? I am also trying to clear up any importance of the original parametric orgin location in the Structural Truss rfa. I inserterted a.dwg at orgin to orgin and it seemed to come in to the left of the center ref. plane. in between the top and bottom ref planes. (kind of random) I cant seem to associate it with anything to understand what it controls it has. Any clarifacation would be appreciated.