I have a crosstab displaying four columns. Let's call the Col1, Col2, Col3 and Col4. I would like to insert two additional columns; the first showing the difference between Col1 anc Col2 (Col1 - Col2) and the second showing the difference between Col3 and Col4 (Col3 - Col4).

 

Is this possible to do programatically in Crystal Reports or do I have to solve it in my sproc?