How appointment slots relate to regular events
When you create a block of appointment slots, the block shows up as a single event on your calendar. To confirm that an event is an appointment block, at the upper left corner of the event, find the Appointment block Appointment. 
When someone reserves one of your appointment slots, the reserved slot shows up as an event on their calendar and inside the larger block on your calendar.
Create an appointment block
- Using your work or school account on a computer, open Google Calendar.
- Make sure that you're in Week view or any Day view.
- Click anywhere in the calendar. In the event box that pops up, click Appointment slots.
- Enter the details, including a title, and pick the calendar where you want the event to show up.
- To add more information, like a location or description, click More options.
Tip: If you want to make the appointment block repeat, do so before you invite others to reserve a slot. When you make an existing appointment block with reserved slots repeat, the reserved slots get duplicated as new slots and double booking can occur.