How do I only share certain types of event
 

I am using Outlook at home and want to create a calendar sharing scheme with
my my girlfirend who uses the Calandar feature on my outlook account. I would
like to set up a joint calendar where certain categories of event (e.g non
work type events) automatically are dumped into a subsidairy joint calendar
(or if need by periodicallly imported) , but where she doesn't need to sift
through loads of irrlevant work appointments.

Thanks