Not "New from existing" per se, but you can add the New Document dialog;
there are actually four commands: New, New…, New Blank Document, and New
Document or Template. “New” and “New Blank Document” both run the
FileNewDefault command, creating a new Blank Document (based on
Normal.dotm). “New…” opens the New Document dialog you get if you use Office
Button | New. And “New Document or Template” takes you directly to the
classic New dialog (accessed via My templates… in the New Document dialog)
that displays both the installed templates and your custom templates in the
classic tabbed New dialog.
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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
http://word.mvps.org