How to use the jsonargparse.ActionSubCommands.handle_subcommands function in jsonargparse

nested (bool): Whether the namespace should be nested.
            with_meta (bool): Whether to include metadata in config object.

        Returns:
            types.SimpleNamespace: An object with all parsed values as attributes.

        Raises:
            ParserError: If there is a parsing error and error_handler=None.
        """
        if env is None and self._default_env:
            env = True

        try:
            cfg = self._load_cfg(cfg_str, cfg_path, ext_vars, _base)

            ActionSubCommands.handle_subcommands(self, cfg, env=env, defaults=defaults)

            if nested:
                cfg = _flat_namespace_to_dict(dict_to_namespace(cfg))

            if env:
                cfg = self._merge_config(cfg, self.parse_env(defaults=defaults, nested=nested, _skip_check=True))

            elif defaults:
                cfg = self._merge_config(cfg, self.get_defaults(nested=nested))

            if not (with_meta or (with_meta is None and self._default_meta)):
                cfg = strip_meta(cfg)

            cfg_ns = dict_to_namespace(cfg)
            if not _skip_check:
                self.check_config(cfg_ns)

nested (bool): Whether the namespace should be nested.
            with_meta (bool): Whether to include metadata in config object.

        Returns:
            types.SimpleNamespace: An object with all parsed values as attributes.

        Raises:
            ParserError: If there is a parsing error and error_handler=None.
        """
        if env is None and self._default_env:
            env = True

        try:
            cfg = vars(_dict_to_flat_namespace(cfg_obj))

            ActionSubCommands.handle_subcommands(self, cfg, env=env, defaults=defaults)

            if nested:
                cfg = _flat_namespace_to_dict(dict_to_namespace(cfg))

            if cfg_base is not None:
                if isinstance(cfg_base, SimpleNamespace):
                    cfg_base = namespace_to_dict(cfg_base)
                cfg = self._merge_config(cfg, cfg_base)

            if env:
                cfg = self._merge_config(cfg, self.parse_env(defaults=defaults, nested=nested, _skip_check=True))

            elif defaults:
                cfg = self._merge_config(cfg, self.get_defaults(nested=nested))

            if not (with_meta or (with_meta is None and self._default_meta)):