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Click "Add Holiday", and the following window will appear:

    

Click on "Add New"
Choose the Department or Public Holiday
Enter the holiday name
Select the date
Enter the duration (e.g., "1" in the number field) 

Department: By selecting "Public Holiday", this will apply to all employees. Department: By selecting a specific "Department", the holiday applies only to that department.

To edit an existing holiday, select the holiday, change the details, and then click "Edit".

To delete a holiday, select the holiday and click the "Delete" button. The selected holiday will be deleted.