You can see the work order context menu option Ranked Appointment Booking only when Schedule Optimization is enabled in the org.

You can get appointments of relevant technicians from the Schedule Optimization engine, by using this work order context menu option Ranked Appointment Booking. You can choose one of the available appointments to schedule the work order. The Schedule Optimization engine identifies relevant technicians for a work order based on the work order’s Primary Territory, Preferred Business Hours, and Appointment Type.

When you click the Ranked Appointment Booking menu option for a work order, the Ranked Appointment Booking screen is opened in a new browser window, listing all the available appointments with date and time slots in a List View. For information about booking work order for an appointment slot, see Ranked Appointment Booking.

For information about configuring Ranked Appointment Booking, see Working with Ranked Appointment Booking.