Customer PO for credit order from History

Hi Team,

While creating a credit order we are giving Customer PO manually int he header and then going to credit memo for selecting the sales order for creation of credit order. In this scenario for all the detail lines customer PO is populating from original sales order lines but not from Header section.

Could you let me know, is there anyway to populate the customer PO from header to detail , instead of original order.

Thanks In advance