1991 Criminal Commutation Act Article 12

Punishments for multiple offenses that have final judgment for commutation and non-commutation shall have sentences determined in accordance with the provisions of Article 2, Article 4, Article 5, Article 7 to Article 9 and Article 11 of this Act for the offenses that deserve commutation, and shall be pronounced together with the non-commutation sentences, then, together with the non-commuted sentences, have Article 51 of the Criminal Code applied for determining applicable execution terms.
中文原文 中華民國八十年罪犯減刑條例第12條
裁判確定前犯數罪,有應減刑與不應減刑者,就應減刑之罪,依第二條、第四條、第五條、第七條至第九條及前條規定減刑後,與不應減刑之罪之宣告刑,適用刑法第五十一條定其應執行之刑。

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