Let's say you have two transaction codes numbered 5 and 11. These transaction codes are no longer going to be used so you want to create a new transaction code, number 99, to maintain the productivity for these now unused transaction codes. When renumbering, you would specify transaction codes 5 and 11 in the Old Number fields and transaction code 99 in the New Number fields. The productivity information for transaction codes 5 and 11 would be combined for the new transaction code 99.