Ctrl-N only creates a new document based on Word's 'Normal' template, so you'll only ever get a new document with whatever setup that has (which can be changed). As an alternative to using different templates, you could add a macro to the Normal template that prompts you for the margin settings whenever you create a new document. It's not clear from your posts, though, whether the margins you're referring to are top & bottom, left & right, or all-around.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]