Why don't you either use different mailmerge main documents or use fields within them to vary the output? No VBA required. A mailmerge main document can even have fields that conditionally insert content from other documents.

From what I've seen of your posts so far, it seems you're trying to force VBA to do something because you haven't learnt to use the other tools. Rather like the apprentice with a hammer - everything looks like a nail.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]