Method 1 (preserving headers/footers, margins, and other section-level
formatting):
- Use File Save As to create a copy of the original document.
- Select all the document before the page you want, and press Delete.
- Select all the document after the page you want, and press Delete.
- Save.

Method 2 (quicker, but loses section-level formatting):
- In the original document, select the page you want, and copy it to
the clipboard.
- Press Ctrl+N to make a new blank document.
- Paste from the clipboard.
- Save.

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Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org