To give an example of this question: A company has made the decision they will gift employees leave for all days between Christmas and New Year that are NOT public holidays, and this will not affect their Annual Leave accruals.
If you DON'T want to track this time as leave
The easiest way to do this is to simply note the time in timesheets as a separate Income type (i.e XMAS LEAVE), and don't link the Income type to a Leave type. That way you can still track the time and value of the entries as an Income type, but you do not have to affect leave balances.
In this instance, you would ask your staff NOT to enter leave requests in Express Leave for the time between Christmas and New Year and only enter their leave requests Before and After this period.
If you DO want to track this time as leave
The easiest way to make this work with Express Leave is to amend the Annual Leave entitlement for all employees on the Employee Masterfile, Leave tab. You can manually add the required extra leave, and this will generate a comment screen where you can notate what that leave was for (i.e. XMAS LEAVE). This comment will then display on the Leave History report.
You can then ask your employees to add these extra Annual Leave requests in Express Leave as normal. The net change in employee leave balances will be zero for the allowed days. If employees are taking any extra leave, then leave balances will be reduced accordingly. Essentially this is like a bonus that is added as leave days rather than paid out.