Format the subtitle with a Style name not used elsewhere the, in the page header for the 2nd & subsequent pages, use a STYLEREF field to refer to that Style. For the page setup, you'll need to use either:
• a 'different first page' page setup; or
• a 'next page' Section break between the 1st & 2nd pages, with the page header for the 2nd Section unlinked from that of the 1st Section.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]