Regulations of the Land Registration Article 114

After the registration of the creation of co-mortgage over many lands to co-secure the debt, the registration of the change of mortgage contents over the original lands, the registration of partial deletion of mortgage and mortgage contents shall be undertaken if one or some lands’ mortgages are deleted or changed.
中文原文 土地登記規則第114條
以數宗土地權利為共同擔保,經設定抵押權登記後,就其中一宗或數宗土地權利,為抵押權之塗銷或變更時,應辦理抵押權部分塗銷及抵押權內容變更登記。

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