Are there any inventory forms that change quantities as needed?
 

I am trying to develop a form that lists furniture inventory and square
footage of 20 different rooms. When entering data into a new sheet for a new
room, I would like to have the same inventory list and quantity of each piece
of furniture item in each room. Ultimately, a summary sheet would refresh
the overall quantity by itself (through a formula that links through all 20
rooms) when I change the quantity in one individual room; instead of having
to do it manually in each sheet. Does such a thing exist?