Hello akber-rao-!
Thanks for posting here. Let me share details on how to track the advance payment in QuickBooks Online.
The first thing we need to do is to create a liability account to track the deposit or advance payment you receive from your customers. Then, let's set up a retainer item that we'll use in recording the transaction and the affected income account should be the liability account you created. It'll be converted into income once we apply the advance payment to the invoice.
You can check the detailed steps here: Record a Retainer or Deposit.
Keep on posting here if you need anything else. We'll respond as soon as we can.
