Enforcement Rules of the Act Governing the Administration of Professional Engineering Consulting Firms Article 11

The business services undertaken by a professional engineering consulting firm or a practicing professional engineer who has established their office in accordance with Article 14, Paragraph 2 of the Act shall conform to the branches of the registered business lines.
中文原文 工程技術顧問公司管理條例施行細則第11條
依本條例第十四條第二項規定承接業務之工程技術顧問公司或已設立事務所之執業技師,其承接之業務,應與登記營業科別相符。

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