In other CAD programs, there is a tool for marking up a drawing - to show adds and deletes, for example. This is done with a closed polygon that has bubbly line borders, if you know what I mean. It looks like a cloud. If you want to indicate a deletion from the drawing, then the cloud should be filled with a "hatch" - like "//////". The hatching should not be so dense that you can't see what is to be deleted.
Has anyone developed such a tool? I hate having to PDF my drawing in order to use Acrobat to draw the clouds.