If you are setting doors in front of an upright and want the top to over pass the doors you must put the doors on the cabinet before you put the upright in.
If you put the upright first and then put a door on each side you can’t change the priority of the top / door.
If this doesn’t answer your question can you post a drawing to explain what you are trying to do?
I wanted to create a cabinet with the top overpassing the doors like a countertop. I used to do it earlier by making the door underpass the top. But now not able to do it. I think i missed a step or two… can you help