Article: How to use a Formula when Calculating Employee Leave.
This article demonstrates how a formula can be used to adjust the calculated leave entitlement on the Employee Data Sheet.
You can use formulas to amend the calculated leave entitlement. This is useful if for example, you wish to calculate leave based on something such as a start date.
The following video shows an implemenation of a simple rule: giving employees an extra day's annual leave if they have been with the company for more than 3 years. Essentially the video shows you that you can insert a column that will add to the annual leave entitlement and within that column you can setup a formula.