Household Registration Act Article 19
Household Separation (Combination) Registration should be made if a household at the same address wants to separate into two or more households, or multi-households in the same household address want to combine as a household.
中文原文 戶籍法第19條
在同一戶籍地址內，不同戶間另立新戶或合併為一戶者，應為分（合）戶登記。