outlook calendar, how can I show the days when I work from home?

In Outlook Calendar, there are 4 options availble when creating a new Appointment :

Free

Busy

Tenative

Out of Office

My company is moving to a "Work from Home" style, which means some days I'm not in the office.  How can I show this in the calendar so that when people attempt to schedule a meeting, they will see the days I'm in the office and  the ones where I'm not?  It's not the "Out of Office" option because I am still available for conference call meetings.

I believe it to be an Exchange account.

Thanks