3.0 How do I record a deposit I sent to a vendor?

Typically, if you are recording a deposit that was sent to a vendor prior to receiving any parts or equipment, you would post a credit to the bank account that you deducted the money from, and then debit the AP account used for that vendor.  You would need to name the invoice and the vendor in the AP line, and could use an invoice value such as DEPOSIT71724 or some other naming convention that will allow you to recognize the deposit and what it is for. Once posted, this will create a "credit" in the AP inquiry for that vendor.

Then, when you do receive in the tires, you will enter it like you normally would.  This will post and create a payable to the vendor in AP inquiry.  You can then apply the credit deposit line to the new invoice you posted to apply the deposit towards the overall invoice total.  Any remaining amount would then still be accessible and display in AP payments to complete the payment.  If the deposit was for the full amount, the invoice would balance to zero and roll to history in the next check run.