This plugin is an add-on that requires the Bookly PRO installed and activated. View Bookly PRO page at Codecanyon. Additional capability for appointment scheduling with Bookly Service Schedule add-on – Limit the hours during the day when a service can be booked. We’ve made this add-on specially for businesses that have got those unique types of services which you only provide during a short time within a day. Individual working hours of staff sometimes just aren’t enough, because a lot of you have staff members providing several different services, and you don’t want to limit other services of that staff member.