Yes, erase42, that is waht I need to do. I did a little work and came up with a way to get an approximate center, and I think it will have to do. I drew lines across the surface, extruded those lines thru the surface, then using boolean "union" and then unstitch surfaces I divided the surface into short segments. I then extracted edges from those short segments, then I placed points on the radius line segments where I thought the highest point was, then I used arc-3 entities to get a radius that was very clost to the highest point. Then I extruded that radius inthe z axis in both direction to get a surface that I could use as a knife to split the original surface into two segments.
The only problem I have is that when I did the final split, one surface disappeared on me. I have no idea why, but it just didn't show up after I did my final boolena operation with the "knife" surface and the orignal surface, when I unstitched the surfaces, one surface disappeared. I also had one of the short segments of the surface to disappear when I did my first boolean-union-unstitch operation.
I attached a file if you would like to see what I did.
This was a lot of work for something that seems like it should be so easy.
I have the different parts in different layers.
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