Hi,
Unfortunately, there is no rule to copy the calendar items to second calendar. However, this seems achievable via VBA. Please take a look at this article and see if it helps:
https://www.slipstick.com/developer/copy-new-appointments-to-another-calendar-using-vba/
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Regards,
Ethan Hua
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