This seems like an odd question, but I have a complicated part that has a face defined early on by an extruded cut. Spontaneously (at least without my intent), the cut has switched from a cut to a boss, making the part very thick. I have no idea how this happened. Since it's early in a complicated part, deleting the feature will cause most of the other features to fail. Is there a way to switch the feature back to a cut, or do I need to find a previous version of the file and redo any unsaved work?
Many thanks for any help.