I have a dataset like below:   Finality        Balance a                    10 b                    15 c                     8 d                    30   First, I would like to sum the finalities 'a' and 'd', resulting in 40. Then, this result must be divided by the sum of all rows. Is there a way to do so, since I have to do the same thing for b and c, separately (dividing 'b' by the sum of all rows and so on)? The final table I need is something like: Finality        Result e (a+d)         0.6349 b                  0.2381 c                  0.1270   I don't know if I made myself clear. Sorry if don't. ... View more