Last year I was told that my wife needed her separate Gold Rewards number to receive Gold Points for her half of our Radisson cruise fare.
This afternoon I consolidated our two accounts for award purposes(still separate accounts) with a phone call to Gold Rewards. The only downside is that you cannot access Gold Point activity for the secondary account (a primary account must be designated) over the internet. However, they will do this for you over the phone.
British Airways offers the same consolidation feature for its frequent flyer program.