code: def branch_deeper(self,
                        new_t1,
                        new_t2,
                        child_relationship_class,
                        child_relationship_param=None,
                        report_type=None):
          
          branch = self.copy()
          return branch.create_deeper(new_t1, new_t2, child_relationship_class,
                                      child_relationship_param, report_type)
docs: Branch this comparison: Do not touch this comparison line, but create a new one with exactly the same content,
          just one level deeper.
          :rtype: DiffLevel
          :return: New level in new comparison line