How do I make a vehicle column not be visible for a certain day?
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How do I enter absences for a vehicle/van?
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How do I enter absences for a technician?
If you want to mark a vehicle's column on the schedule as absent, and you don't want the vehicle column to show at all on the schedule for that day, then you need to enter an absence for the Vehicle. Go to the Misc/Setup pull-down menu, choose Vehicles, and there on the Absences tab, add a new absence for the date range that you don't want that vehicle's column to show on the schedule.
If you just want to block out some time for a day, not the entire day, for a vehicle, then on the schedule screen, you can click and drag under the vehicle over the time frame you want to block out, and then choose Add Activity, and in the Note for the activity, enter the reason for the absence.
You can also enter absences for Employees, but those don't really show anywhere on the schedule screen, so it is usually best to enter absences as described above.