I am trying to develop an import to update the constituent records of employees of our organization who have left. For their currently existing "Employee Office Address", which is an Alternate address the majority of the time, I can uncheck the "send mail?" checkbox, and add the "date to" to the address, but I can't seem to figure out a way to change the address type from "Employee Office Address" to "Former Employee Office Address". Is this possible?

Thank you.