Enforcement Rules of Labor Union Act Article 33

In case that a new labor union is established through merging or splitting, it shall follow the procedures as prescribed in Article 11 of the Act, provided that, the signature of the founding members and the recruitment of members openly are not required.
中文原文 工會法施行細則第33條
工會因合併或分立,而成立新工會者,應依本法第十一條規定辦理。
但不須連署發起及辦理公開徵求會員。

English translation for reference only; the Chinese text prevails. Not legal advice.