Originally Posted by
deltagoldflyer
Call MR (not the AMEX CC line) at 1-800-297-1300
Ask them to "de-link" your other cards from your main MR account and setup new ones for each card.
BINGO you are all set

^
BTW you will need to have a new login for each card now at AMEX but well worth it for the points you could get and end up with long run.
I sent AMEX a secure message last night, and viola, this AM I got a message stating they created a new MR account for my Biz card. Easy as pie! Thanks for the heads up!
They didn't need to de-link them. When I sign into my account on the right hand side I see two MR points accounts and all my cards are still listed. Whoohoo!