Custom fields associated with a period of time on a specified day of the week during which field service work can be performed in Field Service. Operating hours consist of one or more time slots.
The standard fields are documented in the TimeSlot object reference.
Description: The type of designated work time slot. To convert a regular time slot to a designated one, use the calendar editor in the Visualforce page instead of editing this field manually in the record page.
Additional values are added by the managed package when a time slot is converted to a designated work type. The values are the API names of the designated work boolean fields on the service appointment.