I still don't know what you mean by "moving them from a shortcut to the public folder," but to display a public calendar folder in the Calendar navigation pane, you need to display the Folder List and drag the folder to Public Folders\Favorites. It should then show up in the Calendar navigation pane automatically under Other Calendars.
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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers