Drill down into different data

Hello, 

Im trying not only switch the axis when drilling down, but also the values. 

i.e. start with:

Axis: Projects     Value: Total expenses

To

Axis: Employees     Value: Expense A,  Expense B, etc. 

I have found this:

ChangeInDrillDown = 
     VAR  AverageCalc = AVERAGE(TableName[Amount])
     VAR  SumCalc   = SUM(TableName[Amount])

RETURN
IF(ISFILTERED(TableName[DrillLevel]);SumCalc;AverageCalc)

However i cannot find the ChangeInDrillDown on the microsoft website and it gives an error in DAX when creating a measure. If it is correct, where do i input the code and how do i get the drill down button to respond to it?

Or is there another way to achieve the above?

Kind regards, 

Ad