It's easier that you might think (but isn't everything once you've learned it?) Your Envelope Path has multiple points. Any one of those points can be turned into a Cross Section. You can also add a point anywhere on the Sweep Path or Envelope Path with the Bezier tool located next to the Pen tool in the spline modeling room. If a cross section already exists at a given point, you can also delete it. The Crenelation CS was created at a point further down the Sweep Path. That way I could see it easily in the directors camera. After the cross section drawing was complete, (mine is actually an imported Adobe Illustrator path) I used the Arrow/Direct Select tool, grabbed the point on the Sweep path and dragged it back to the Circle Cross Section. (The shift key was held down to constrain the point movment to a straight line so I wouldn't get a goofy bend in the shape) The picture probably does a better job explaining it that I do. Mark