Booking: Only Allow Bookings During "Free" Events

Hello,

My college just turned on Bookings, and I would like to use it to schedule my office hours.  I see there is an option to make an event "bookable when staff are free". This is great, but there are sometimes I am doing other office work and don't want to be bookable by my students (the users of the Booking form), but still may want bookable by my boss, other departments, etc.

I've previously used YouCanBook.me, and one of the features I really liked was the ability to setup a series of calendar entries where my status was marked as "Free", and only those blocks would be made bookable.  Is this possible in Bookings?