How are you applying the Heading 1 Style? When I apply it to a mergefield, the Style s preserved through the merge. Do note, though, that you will lose the Style definition if you've applied it to only part of the paragraph - it must be applied to the entire paragraph. In that regard, if you don't want 'Name:' to be included, that should be in a separate paragraph, which you can then 'merge' with the paragraph containing the mergefield via a Style Separator or by formatting the paragraph break for the 'Name:' paragraph as hidden text.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]