Without seeing your mailmerge main document and, perhaps the data source, it's difficult to say what the best approach might be. For a single set of repeated data, one might use a catalogue/directory merge but, because you have multiple sets of repeated data, I suspect a DATABASE field might be more appropriate in this case.

Can you attach a your mailmerge main document and some sample data to a post (delete anything sensitive)? You do this via the paperclip symbol on the 'Go Advanced' tab at the bottom of this screen.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]