How to want to enter an absence for a longer period. You can do this on the same principle as planning via a work schedule.
The video below explains how to do this step by step
Click on the employee's + button and then select the absence icon. Then click on the schedule icon to enter an absence schedule
You can then define the duration and type of absence.
Drag and drop the absence schedule and save to put it in the schedule.
The absences will come as grey slots in the schedule for the entire period you have determined in the schedule.
Please note that you cannot create an absence schedule for a period with an existing schedule. Via multiselect, you can easily convert existing planning to an absence.