Hoping someone can help here. I have a simple solid wall 300mm deep with perfect geometry. Over the top of that wall I have laid a flat 2D CAD drawing (elevation) which I would like to snap to as I punch holes in for the windows. However When I try to do that it just draws a new face as a separate object rather than cut in to the face of the wall behind. When I hover over one of the corners of the CAD window it says its outside the active area but the CAD is flat on the face - I’ve double checked this. I can cut a rectangle no problem into the wall but just not using the CAD to snap to. I thought Sketchup was more intelligent than this and would recognise I was wanting to cut a face. I know the CAD is completely flat. Any Ideas?