To do this, go to the employee's profile and open the holidays tab. From here, click manual adjustments to bring up a new pop-up.

Enter the value of the adjustment into the duration field. To add time, just enter a number (e.g. to add one day, just enter '1'). To deduct time, include a hyphen at the start of the number (e.g. to remove 1 day, enter '-1').

 Managers can make adjustments to holiday for their staff while Admins can make adjustments for all staff.

NB: Please note that adjustments are temporary, and will be cleared when your holiday year renews. If you want to change a staff member's basic holiday allowance, please go to this article.