I am creating a fireplace family in Revit Architecture 2012 with wall host (Speciality equipment with Wall host). I selected the template created the family, but in mean time i can't understand the wall is having delete option.(i.e it is released from host). I am surprised to see that in the family type, the wall host is missing. Can any one give me the feedback, how to host it again.
If you have already deleted the generic wall hosting element from your family, I think the only way to proceed is to start a new family from the generic wall hosted template and copy your geometry into the new template.
If I am misunderstanding your question, please post with more details.