Oh I see. Yes we have a misunderstanding. I'm not trying to import multiple cross-sections. That is an option for what I want to do, in fact I did try it on this model. The problem with that approach is I need to reposition the cross-sections vertically and then smooth all the lines. The image shows one of the shapes I'm trying to make. In this case the top-view envelope is symetrical in plane; the side-view one is free, since the top and bottom splines are different. I made this object as stated earlier. I loaded the cross-section, and then loaded the envelope. After changing it to free, I edited the point y-values in the two side-view envelope lines.

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