Purchasing:How to mass change handler

Background: At times, there may be a need to switch the Buyer (Handler) who is responsible for an item from one person and another person. There is a program written that allows this be done as a "mass change". The program will allow a authorized user to typically switch all the items from one vendor & a specific Buyer to another specific Buyer. Or, the "mass change" could be to used if a Buyer leaves and all items associated with that person need to be switched to another person.