Contouring a 3D object in Enroute

[mountie1808]

I've finally figured out how to create a millable surface from a 3D object in enroute. What I can't find is how to add a contour around the 3D object (of any size) aside from starting with either a hand drawn line or generic poly shape as the base relief. A different way of stating the question is this: how do you create a contoured relief upon which to add the 3D relief?

Does this question make any sense?

Mike