Keith, the easiest way is to draw the cutting plane while editing the group or component. That way it will be part of the group or component.
You can also edit one group, select all of its geometry and run Intersect with model. If you are trying to intersect, for example, door frame components with miters, there is no intersecting edge between coplanar surfaces. You'll have to complete the miter by hand.
I'll see if I can't do something more complete on this in a little while. I'll make a video demo tonight or tomorrow night at home. The machine at work doesn't handle that sort of stuff well.
Last edited by Dave Richards; 05-01-2007 at 12:59 PM.
Irony: The opposite of Wrinkly