code: def update_title_to_proceeding(self):
          
          titles = record_get_field_instances(self.record,
                                              tag="245")
          for title in titles:
              subs = field_get_subfields(title)
              new_subs = []
              if "a" in subs:
                  new_subs.append(("a", subs['a'][0]))
              if "b" in subs:
                  new_subs.append(("c", subs['b'][0]))
              record_add_field(self.record,
                               tag="111",
                               subfields=new_subs)
          record_delete_fields(self.record, tag="245")
          record_delete_fields(self.record, tag="246")
docs: Move title info from 245 to 111 proceeding style.