Copy/Pasting content which includes section breaks from an existing document into a new 'template' document results in only the last section including the 'template' header and footer. The earlier sections will still have the previous header/footers that they had in the source document. This is because the page setup, header and footer information for each section is held within the section break that follows the content.

So simply copying content from the source document doesn't necessarily change the headers and footers for all the document UNLESS there are no section breaks in the copied content.

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Andrew Lockton
Chrysalis Design, Melbourne Australia