When there is a lost reference (projected geometry), I would like the option to replace it.
Right now, you have to delete it, select new one, AND then reconstrain.
For the picture below (just to simulate my complaint), I modeled a box, and then created a cut extrusion through it (the circle). After doing so, I decided to split the box in half, making upper half a solid body, and the lower half a separate solid body. The lost reference is in magenta.
I understand that the reference rightfully is lost, but I want to be able to repair it. Yes, this particular model would be an easy fix, but complex parts could be a pain, ESPECIALLY in top down modeling where there is lots of referencing going on.