@semperfinci
Disregard the advice from @KayePe. It's nonsense and will mess up your books.
If you haven't already, set up an Other Current Liability account called "BILLD Payable". Enter bills from your vendor as you normally do. Then, create a Vendor Credit(s) for the amount of the bill(s) and assign the newly-created "BILLD Payable" liability account to the credits. Now, pay the bills with the credits.
At this point, you now have the expenses recorded from the bills and an offsetting amount in the BILLD Payable liability account since you owe them the balance. When you issue final payment to BILLD, write a check (or record an expense) and assign the principal portion to the BILLD Payable liability account and the interest portion to Interest Expense. That's it.