At the moment I am using the following formula:
    #+TBLFM: @<<$4..@>>$4 = $2 - $3 :: @>$2=vsum(@<<$2..@>>$2) ::
@>$3=vsum(@<<$3..@>>$3) :: @>$4=vsum(@<<$4..@>>$4)

This does what I want, but there are two things that could be improved.

- The second, third and fourth formula do exactly the same, only on
different columns. Could this be rewritten to one formula?

- The line becomes long and hard to evaluate for a person. Is there a
possibility to put the formulas below each-other?

-- 
Cecil Westerhof