A little late seeing this, but I hope that this helps:
I have a corporate AMEX that I spend a LOT of money on.
I pay a $90 AF to keep my corporate AMEX points (the $90 AF hits my corporate AMEX, but I mark that expense as a private expense and they deduct it from my check. I set it up by calling the number on the back of my AMEX card (you can call this number - AMEX membership rewards direct number: 1-800-297-3276) and simply asking them if I could keep my points and they said yes. I use my corporate AMEX login to go to this website and view my rewards:
www.membershiprewards.com
1 point earned/$1 spent
Redeeming - flights/hotels booked through AMEX - can transfer points to flight Delta, Hawaiian, JetBlue, Bonvoy, Hilton Honors, Choice Privileges, gift cards, etc.
Also can transfer points to personal platinum or gold or green cards, but not cobranded cards.