Have a look at this screenshot which I created in Excel
Yes you will be able to drag and drop the cat from one cell to another (assuming you have one cat per box)
I am not sure how you want to graphically represent 3 stacks on a two dimensional sheet. If you can send me a sketch I will try to translate it into Excel
No it didn't, I just didn't know where the discussion was going as I did not get from you a clear answer about how to represent the multi levels.
I will prepare a suggested solution. Give me a few minutes...
Ok here is the file in OpenOffice format.
There are 3 rooms with 3 levels of boxes in each
I hope this ok. Please feel free to get back to me if you have any questions