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It would be nice to be able to get a polyline of the boundary of a surface without having to explode my surface. It should work similar to the export menu in corridors.
What I found that works is to CopyByBasePoint the CorridorSurface to a new Drawing (preferably with only one layer) and explode the surface twice. Now you have the boundary line as a polyline... Edit it as needed.
Click on the surface. Look at the contextual ribbon > Export Objects from surface > Choose the border. The ribbon didn't exist in 2006. This command may have. I know it was there in 2008.
