As provided by 72-2-825 and 72-2-826: (1) a powerholder may disclaim all or part of a power of appointment; and (2) a permissible appointee, appointee, or taker in default of appointment may disclaim all or part of an interest in appointive property.
Disclaimer
Mont. Code Ann. § 72-7-401, under Disclaimer on Release -- Contract to Appoint or Not to Appoint.
Mont. Code Ann. § 72-7-401