list comparing - vague data
 

i need to compare 2 lists.

i have a multi array, and want to add text to an extra column, cant
remember how to do this the best way

example:
it could be
bob - startdate - managerName - end of cols

or
bob - leaveDate - startdate - managerName - end of cols

what i need is
bob - startdate - managerName - "OLD" end of cols