Defaulting variable pay percentage based on Depatment and Grade combination

Hi Team,

We have a requirement where,Different variable pay percentages based on the department and grade values.

Scenario : Lets take we have 5 departments and 3 Grades

In this we have variavle pays as fallows

1.For Grade1 Variable pay Percent is 0

2. For Grade2 Variable pay Percent is 10

3. For Grade3 Variable pay Percent is 20

But in if the employee is from Department B and Grade1 then Variable pay Percent is 10

So we need approaches to achieve this

Thank in Advance

Regards,

Pratibha