In the client the invoices are split based on the customer purchase order number in the sales order. But only one invoice is required to be printed for the same customer. Because in the custom they pay a custom fee for each invoice. Now they prepare a manual summarized invoice and they add the custom fee in only one invoice in the system manually. This custom fee is required to be determined automatically in the splitted invoices.As there are several invoices in the system based on the purchase order number of the customer in the sales orders, this pricing condition should be divided in these invoices automatically. How can I configure it?