Holiday carryover is initially assigned to staff when they are onboarded to the system based on the settings of their working pattern. Read more about this here.
You can change the holiday carryover limit (and annual allowance) for a staff member by navigating to the Settings tab on their Profile. From here, scroll down to their admin settings section and use the maximum holiday carryover text field to update the employee's carryover limit.
Alternatively, you can update holiday carryover limits for all employees in bulk using our staff import function. More information on how to do this can be found here.