Basic Code Governing Central Administrative Agencies Organizations Article 15

Second-level and third-level agencies may establish regional branches with regard to the needs of their jurisdiction areas and grassroots services within their scope of authority and duties as governed by organic laws.
中文原文 中央行政機關組織基準法第15條
二級機關及三級機關於其組織法律規定之權限、職掌範圍內,基於管轄區域及基層服務需要,得設地方分支機關。

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