Can I have fixed time slots?

Yes, you can set any periods with any kind of recurrent intervals.
To do this, use the Event resource type. And in the rules of work, configure necessary time slots.
As a result, the customer will see these time slots after selecting the specific day.
If it is a multi-day event, the slots will show the time and number of days.
You can set the color of the slots to be the same as rules. You can add names of the work rules and number of shares left into the slots. To do this, open the resource settings and set checkboxes:
  • Use button captions with rule names
  • Paint buttons using color of rule
  • Show number of shares left
Here you can also set the checkbox to display slots as a list for the whole month.
Here is a live demo:
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