FIXED!! to have transactions import for all additional users for American Express including main account.  Each user has a user name and password.  You will need to know this information so you can merge the accounts. 

1.  Go to chart of accounts.  Create a new credit card account.  You might want to call it "Amex Parent Account".  It will ask you the balance.  Go to your main account and enter the balance for todays date. (you will not want to link this account you just created in the banking page)

2.  After you create the parent account, find the original Amex credit card account that was importing in QuickBooks originally and edit that account.  Under where it shows sub account check that box and select the parent account that you created above.

3.  Go back to your main banking page.  Link a new account.  You will want to link the additional users amex credentials.  After it links the account go back to chart of accounts and edit the account and select sub account as the parent account.  You will then see the main account on your banking page and it will bring in all the transactions.  If you have more users, you will need to do this for each user account.  You may want to import the transactions manually for the main user before you do this so you have all the transactions in there from previous dates but this works!!  If you balance if off in the parent account, you could always journal that balance to fix it by selecting the new button and selecting "Journal Entry".  Hope this helps!!