the only way to do that is to set up a GL account for the credit card and use that as the cash account.  so as you are paying your vendors, you are crediting the cash/credit card GL account.  when you pay the credit card balance you debit this account and credit you bank account.

you can still prepare an expense report and attach it to the credit card payment  but this transaction will only debit the creditcard GL account.

Allan,

Add yourself as a Vendor and set up a GL account in the Liability section of the Chart of Accounts called Credit Card Payable-Allan. When you purchase something on your personal card that you want to track to a specific Vendor, enter an invoice for that Vendor and charge the correct GL account for the purchase.  When you get the credit card statement, you will pay each Vendor for all of the invoices that are on the statement and instead of using the cash account, you will use the new GL account Credit Card Payable-Allan. (this will create a credit balance for that account). 

For the Credit card statement, enter a purchase and pay later (or directly to payments) pull up your Vendor ID, enter an invoice number such as Allan_stmt date (for purchases) and for all of the purchases you already paid through the other Vendor ID's you will enter the GL account Credit Card Payable-Allan, (this creates the Debit side). For the items you purchased that you do not wish to track to a Vendor, enter those purchases to the correct GL account for those respective purchases.  If you enter as a purchase, then all you have to do is pay yourself back.