Word vs Word Perfect

Back in the day when I used Word Perfect, when merging letters you were able
to put a pause in the merge so that the merge would stop at a specific field
and you could enter information that was specific to that particular
addressee. You could also set up a merge with information specific to each
addressee, i.e., different class times, dates, etc., and merge all of that
into the template. Perhaps Word does that also but I have never been able to
figure it out. Any suggestions?
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Diane