Hey there, @Kahuna32.
A line of credit is a liability account that you can set up in the Chart of Accounts. You can use this to record the loan that you borrow from your bank. However, you can't use it to pay your employees in QuickBooks Online (QBO) Payroll.
You'll need to have a regular bank account and use it to pay your employees in QuickBooks. Just make sure to enter the correct routing number and account number of the checking account. This way, you can write payroll checks for your employees and pay your taxes.
You can also check our Getting Started with Payroll Guide to easily manage your payroll. This also includes the essential info you need to get started with payroll tasks.
If you have any other concerns or questions, just tag my name in the comment section. I'll get back to you as soon as I can. Stay safe.