From within the Profiles list on the N85 handset itself I don't think you can delete any of the pre-installed profiles. You can, however, rename all but the General profile. Any user-created profiles can be deleted provided this didn't start out as a pre-installed one in which case it can't be deleted.
I don't know whether it's possible to go into the phone's registry or "private" folder and locate the profiles there and delete them that way.