Novice needs help with cosolidating in mailmerge document

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I have a data table which contains multiple records for the same individual.
Is it possible in the mail merge process to send the one individual one
letter containing different types of information? For instance, I'd like to
send a mail merge letter to Mr. X containing purchase information he has made
throughout the year. How do I go about making sure Word does not create
multiple merged letters for Mr. X?

Confusing? Hopefully not.

Thanks in advance for any assistance you may be able to provide.

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