Can't do it unfortunately. D-Tools believes that's naughty and they don't allow it

. As a result you'll need to use non-Dtools shapes, or learn to modify D-Tools shapes so they don't force you to add an item.
I feel for you, it's particularly frustrating when you need to do something as simple as draw some lights on a plan, or add a phone jack to show something that is existing, and D-Tools wants to force you to add 10 lights and a phone to your proposal.