Enforcement rules concerning the implementation of industrial group act. Article 4

Regarding factories with both industrial and commercial business licenses, if they set up sales department or sales offices outside of factories, they should affiliate to both industrial board of trade and commercial trade council .
中文原文 工業團體法施行細則第4條
工廠領有工廠登記證照及商業登記證照,如在工廠以外另設售賣場所,公開售賣者,視為設有門市部,應依法分別加入工業及商業同業公會。

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