Employees leave can be adjusted through the Previously Accumulated Field on an Employee Profile.
Calculate how many extra leave hours the employee has accrued, for example: 24 hours of Annual Leave
Navigate to Menu > Settings > Employees > click the Edit button for the effect employee
In the Employee Profile go to the Previously Accumulated area:
A negative adjustment can also be entered, for example: -36
Navigate to a recent unlocked payslip for the adjusted employee.
Click Recalc Leave located on the top of the employee's payslip.
This will now update the employee's balance with the adjusted leave.