Option to update Payment on Multiple Invoices

Would like to be able to update multplie invoices at once to change the Payment Option. They way they due business the person that is checking the customer out does not know what payment option to put down for the customer. So someone has to go in and manually update each invoice under the AR tab.

From Client:
Because our store front/tire shop/ ag guys are not going to know who, when or what to change them to on every customer. Changing an entire months worth of transactions manually is terribly frustrating on 20+ customers that are using John Deere Funding.