Have to deal with the Grandson for a while but still getting back to the map when I can escape him.
Don't give up, (stompem never gives up) keep the map until you know more and come back to it. Learn to Use layers they will come in handy when your maps get more complex. Layer1 top floor or 1st, 2nd floor etc
Layer2 Stairwell1 etc
Layer3 2nd floor furniture etc
Also helps when you return to a map and have forgotten placements, professional map makers would be unable to map efficiently without them, trust me you will like them when you are used to them....
have to go out for an hour, I will check in here for an update to the situation and continue on if necessary.