It is probably a simple solution, but I have not had any success in searching for it in the knowledge base or on the forum. I have laid out the a simple first floor with two main areas, kitchen and living room. The walls were put up first then the pass through was added and I had now problems initially defining each area. The problem is at some point playing with room dimensions etc. both rooms are now the same object and I cannot find a way to reset or remove the object definitions so I can redefine them accordingly.
Thanks
Matt