It doesn't matter that the merge field values are coming from a different system. That is to be expected. What matters is that you're using 3rd-party software (Aspose?, Conga?, RSA Archer?, Salesforce?) for your merge and you're limited to whatever options that software allows; it has nothing to do with Word.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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