Wall Molding Design

I have a client that wants wall moldings on the wall. I can’t figure out how to do this in DesignFiles. I need a ruler, but there is none available once I click on “Edit” for the wall. Also, I don’t see how to keep a shape “unique” and not “stick” to anything I overlay it with on the wall. If there is a way to do the above items, please share, and if not, can it be added?