I think what you are trying to do is: you create a room and a wall and then you want to pick the newly created room plus all of the previously created walls and check for overlaps. Right?
Yes, that's correct. We're trying to get it so that the red hallway will only check to see if it is overlapping walls that it was not created with. I am still personally very new at Construct 2 and I'm not asking to have every little thing done, but if you could point towards a solution that would be incredibly helpful!