Help deleting walls on building
I usually have no problems deleting walls on other buildings, but the one I'm working with has the walls as bones (is that the correct term) instead of objects? When I try to delete the walls, for example, it deletes the whole building. I tried deleting them with the JointEditor, but it removes the reference in the Scene window but the wall doesn't disappear. Help! :)

Comments
If they are bones you can simply hide them - invisible objects are not sent to te render engine at all.
As Richard suggests, hiding them is probably best. If you need a more permanent solution, you can use the Geometry Editor tool to delete polygons by selection or even by surface (super handy!)