I am working in Revit 2013 and I have a wall type Basic Wall Foundation 12" Concrete in the basement of the home I am working on. When I try to add a continuous footing, I do not get that option. I am practicing Revit using Paul Aubin's book REvit Architecure and Beyon 2013 and in chapter 5 we add a footing to a basic wall and it worked. Is it because I am trying to add a footing to a foundation wall? I really need help.