[Raleigh Older[_2_]]

I have a letter that I will need to insert different data, like names etc.
and I need to put a stop code or insert that will allow me to insert data of
different lengths in the base letter. I'll need to change the date, inside
address, etc. I've done this but it's been a while and I can't locate what
the code is or how to do it. HELP. Thanks!