Leonard Dichiara wrote:
Since the file was created likely using surfaces and lofts does this mean I will basically have to rebuild the file?
Yes, you will have to rebuild the file (if you want to edit using a feature history tree, otherwise you could try one of the direct model editors).
It might be easier and faster to request an original file from the source of the intellectual property.
If the changes are restricted to a localized area, you might be able to cut away that area and then build your new surfaces and knit them to the original. You might be able to use the Replace Face command as well.