Our programmers have set office hours where users can book meetings, call
them and they can handle administrivia. This is about 7 hours a week spread
out during the week. The remainder of the time they cannot be booked for
meetings, etc.

How can I set it up on the calendar function so that meetings are not set,
whether individually or based on recurrence on these hours. Is there a tools
options setting that can set the bulk of the time as "busy" and then the
"office hours" time as free?