Solved! Go to Solution.
Solved by melarch. Go to Solution.
This method of unsplitting doesn't work on walls with built-in sweeps or reveals. To do so, you should duplicate the wall type and remove the sweeps/reveals. Change all segments that you want to join into the new type. Click the end-points to re-join them, and then change back to the wall type with the sweeps/reveals built-in. Delete the unnecessary wall type.
For some reason, I had to change my wall location lines from "core centerline" to "wall centerline" to make this work for me.
Also note that you have to drag endpoint onto endpoint. Dragging one wall's end past the other creates overlapping walls, instead of merging the walls.
(I'm at like 98% construction documents with a huge building, and I was delighted to be able to get this to work. I have lots of dimension references established to these walls that I needed to keep hosted, and unsplitting keeps all those references.)