while preparing sale invoice from QBO we found only one dedicated field for mentioning PO number. But in our case there are multiple PO number in one sale invoice .

In QuickBooks Online (QBO), there’s one specific field that is usually provided for the PO number on invoices, Meena.

You can use custom fields to include multiple PO numbers. However, keep in mind that only up to three custom fields can be added to a single sales invoice. If you need to include several PO numbers, I recommend using the memo section on the invoice as an alternative.

You can refer to this article to learn how to effectively use custom fields in QBO: Add custom fields to sales forms and purchase orders in QuickBooks Online.

Comment here again if you need further assistance with managing a PO number in the program. We'll be right here if you need help.