Slicer that allows face specific parameters

Is there a slicer that will allow one to specify parameters to a specific face. I am building a part that has internal walls and external walls. Actually each part is 1/4 of the final part and is bolted together. After the part is bolted together only one of the walls is external and it would be nice to be able to apply specific parameters to that face, ie wall thickness. Is this allowed by any slicer?