Subtracting Sales for 2021 from Sales for 2022

[ProfPhidd]

I have a Crosstab showing Sales nesting 2021 and 2022 columns.  I would like to create a third column representing the difference between 2021 and 2022 Sales.  How do I do this? 

AP

[Taoufiq_Zarra]

@ProfPhidd 

if you always compare the current year with the previous year you can change sum(sales) to have two measures

=Sum({$<Year={$(=max(Year)-1)} Sales) ---> for 2021

=Sum({$<Year={$(=max(Year))} Sales) ----> for 2022

and then add measure difference

=Sum({$<Year={$(=max(Year))} Sales)-Sum({$<Year={$(=max(Year)-1)} Sales)