I have three certificates for one night each at a Ritz Carlton Hotel - Tier 1-4. However, there doesn't seem to be a way to redeem them online with reservations. Some folks have said that Edition Hoteis don't count...but the website says they do. Any advice other than calling reservations?
Book as if you're using points, and if you're booking a 1-3 night stay at a tier 1-4 ritz or (possibly edition, not sure), you should have an option to use certificates for your stay. (you'll see this on the last page, just before you click "book now"
If your stay is more than 3 nights, you would either need to book the 3 night stay, and then the additional nights on another reservation, or call customer service.