I guess, I don't understand your question, but to use a BB you need to book in a Marriott or Ren hotel (no courtyard, etc) for the entire six days. You need to book on a "publically available rate" - a rate that would appear if you leave all boxes unchecked (some people say AAA rates are OK - but usually they are just a few dollars less, and not worth the possible hastle). One reservation of six days and three coupons should work fine.

Lastly, inform Marriott that you will be using BB. Most of them say "should" some say "must" inform of use of BB. Never hurts to have it documented. In my experince, they are very easy to use.

Billy