def METHOD_NAME(self, fold_set, name, id):
    file_name = self.create_name_from_id(name, id)
    fold_file = _FoldFile(fold_set,
                          file_name,
                          sep=self._line_reader.get_separator(),
                          column_description=self._column_description)
    self._folds_storage.add(fold_file)
    return fold_file