Hello dear, J_P_A. I'm here to help you clear things out.
What you did is right! When we receive an invoice from the vendor, we'll have to enter bills and pay them using the pay bills transaction as you do.
A bill transaction will debit the AP( Account Payable). Basically, the 1099 Detail report will show as account payable since you're making payments to your vendor. So every time you create a bill, it will automatically show what account is being affected on that transaction.
Also, if you mean that you're getting double amount in the 1099 Detail report, QuickBooks records the original amount which means recording the total amount that we should pay to our vendor. In the Paid Amount column, it shows the partial payment amount. Then, in the Balance column is your remaining balance to your vendor.
Get back to me if you have more other questions. I'm just right here to provide you more information on how the 1099 reports work. Take care!