it's not a feature offered by outlook or exchange - you'll either need to
find an application that can do it or learn how to program.
http://www.slipstick.com/addins/calendar_schedmgnt.asp

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Diane Poremsky [MVP - Outlook]
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>I work on an exchange based network and have calendars that I would like to
> link together. I have a master calendar that I would like to link to a
> number of secondary calendars. If I make an entry on one of the secondary
> calendars I would like for it to link with the Master. The idea being to
> have multiple secondary calendars updating the master. Any ideas?