Thanks for visiting the QuickBooks Community today, info1901!
We will guide you in recording your deposit and PO. However, can you give us more details of the scenario? When you said you received a deposit, did it come from your customer, bank loan, or capital investment of the company owner? And, what does this have to do with PO?
Just for an initial answer. We cannot associate deposits (money in/money in the bank) to purchase orders. Once the POs becomes a bill, that's the time we can apply the deposit as a payment.
Thanks in advance for any additional details you may have.