How to record advance payment for the sales order on web

We apologize that the feature you’re looking for isn’t available right now, but we suggest you record the advance payment from the customer ledger. Once you convert the sales order into a sales invoice, you can settle the invoice through the advance.

Please follow the below mentioned process to record advance payment.
Kindly go to the customer >> click on the Ledger >> click on you got >> enter the amount >> select the payment type >> click on add Payment.