Copying and Pasting between documents often causes layout issues. The tricks to avoiding these are:
1. Make sure both documents have EXACTLY the same style definitions. Do this by basing documents on the same template and refresh styles from that template.
2. Ensure all the same page setup/header/footers are in both documents. You can include a trailing section break in the copied content if you want to import those same settings and header/footer content when you paste.

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Andrew Lockton
Chrysalis Design, Melbourne Australia