Yes, I searched.
Yes, I have a good reason. I inherited a design from someone else, who originally modeled a part as sheet metal. At some point, for whatever reason, he added thickness to represent a thick metal plate. All was fine until I needed to add a cut partway through the thickness. This doesn't work in sheet metal. I tried the obvious things, like deleting the sheet metal feature. But that deletes everything.
There are hundreds of threads on converting solid to sheet metal. I can't find one that answers this simple question. How to go back?
Thanks in advance,