That should be the default behavior if what you're referring to as Address
Line 2 contains nothing but one or more empty field(s). (This is assuming
that you're not using a very old version of Word - at one time the behavior
was just the opposite & a special setting had to be used to shift lines up.)
For example, if your label setup is something like:
<<First Name>> <<Last Name>>
<<Address1>>
<<Address2>>
<<City>>, <<State>> <<Zip>>
City, State & Zip will shift up if there is no content in the Address2 field
for any given record - the blank field won't create a blank line.
OTOH, if you have something like:
<<First Name>> <<Last Name>>
<<Address1>>
<<Rural Route>> <<PO Box>>
<<City>>, <<State>> <<Zip>>
the third line will "print" (as a blank line) even if both fields are empty
because of the [sp] between the two fields. The article John pointed you to
addresses this.
HTH |:>)
Bob Jones
[MVP] Office:Mac