It is not working becuase you need to reference the rows in the sum function. So it should be something like this:
Sum(Row1.sq1 + Row2.sq2 + Row3.sq3) etc
You can make it easier for yourself by naming all the rows the same thing (eg. Row1) and all the total cells the same thing (eg. Total) then it will automatically rename them Row1[0], Row1[1], etc.
Then for the sum of the columns you just need to put Sum(Row1[*].Total).