Hi,
Follow these steps:
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Click the "New Page" link in the toolbar.
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Set the name of the page.
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Set the URL to the full URL of the page you want the menu item to link to.
I know you said you don't want to create another page, but this really isn't a page and it will function the way you want it to function. The user will see a menu item that links to an existing page, not a separate page.
HTH,
Joe D.