Are the columns Measures or a Dimension? i.e. are C3 and C4 2 different measures in your measures list?
I have an almost identical question to bhanu v. How would a variance be calculated if these are one measure being shown. The columns would represent a time series, rows would represent employees, with values being sales figures.
C3 - January 2013
C4 - February 2013
C5 would be sales growth/decline from February to January.
What would be the best way to calculate C5?