Instead of trying to do this with direct formatting, you should be modifying the underlying Styles. If you make those changes to a document template, they'll automatically apply to all new documents based on that template. Furthermore, having made those changes to the document template, all you'd need do to apply them to current documents is to check the 'Automatically update document styles' property in each of the applicable documents. No VBA code needed.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]