Default payment term on credit sales orders?

We have a separate version of sales order entry for credit orders. I was surprised to see there isn't a processing option for a payment term - or am I missing something?

The payment term for the customer offers a discount if paid within a certain number of days. If we enter a credit order for that customer, we don't want to be discounting it. Is there any way around this other than to change the payment term on the header of each order?

We are on 9.2

tools 9.2.2.5

This would be for either Distribution or Finance.