Doors under Archways

I came across some areas in the official campaign maps where a door is placed nearly directly under an archway. It seems impossible to duplicate from scratch. Is it possible, and how?

select your doodad, hold ctrl, and use the numpad to move your doodad around.

Oh, wow, thank you. :) I had read and tried this before, unsuccessfully, but never had numlock on, so didn't understand. Now it so much easier. :)