Insert and If...then...Else field
{ IF { MERGEFIELD afieldthatmaybeblank } = "" "{ MERGEFIELD nextmergefield"}
"{ MERGEFIELD afieldthatmaybeblank } { MERGEFIELD nextmergefield }" }

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Hope this helps.
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Doug Robbins - Word MVP
> does anyone know how to suppress the blank space that is left in a mail
> merge
> doc if the field is blank?