Because QB will not allow a liability account to be used to pay bills, you have to shuffle the funds
In the chart of accounts, create a cash type bank account and name it Clearing
1. Show a deposit in the Clearing bank account for the amount of the bill and use the loan liability account as the source account for the deposit
2. in pay bills, select the bill, set the account to pay from to the Clearing account, and pay the bill
Later when you pay back the loan enter the payment and use the loan liability account as the expense (reason) for the payment