Between me and the wife - we have several award nights due to cc anniversaries. Most of the Amex ones are capped at 35K per night, so cat 5 properties. The one from Chase RC card is capped at 50K per nights. Can we add extra Marriott points to these certificates to make them usable on higher category properties? We have a modest balance of Marriott/SPG points - and wondering if adding points are allowed.

Example: The Amex cat 5 nights - there are 4 of them, so if we want to use for 4 nights on property with 50K per night requirement, can we add 60K (4x15K) to make it work? Or is that not even allowed?

Thk you in advance.