Enforcement rules on the implementation of commercial group act Article 40

When the member representatives of commercial association of county (city) or municipality directly under central government exceed 300 persons, preliminary meetings according to the division of districts should be held before the general meeting in accordance with Article 30 of the act, and representatives are to be elected pro rata from each district to attend the general meeting.
中文原文 商業團體法施行細則第40條
直轄市或縣(市)商業會所屬公司、行號會員之會員代表人數超過三百人以上時,該會得依本法第六十二條規定準用本法第三十條就公司、行號會員之會員代表,依地域區分,先期分開預備會議,按比例選出代表,再與團體會員之會員代表合開代表大會。

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