Sum column if cells are outside range (range = leftmost value in row + next 11 columns) R or Excel?

Question

Please see the picture. In the matrix pictured, an entry is considered \"New Business\" from the leftmost value + the next 11 columns (so 12 months total). I\'ve highlighted thi

Answer 1

I added a helper column C that finds the first non blank in the row (my data went from column D to column AZ)

=MATCH(TRUE,INDEX((D2:AZ2<>0),0),0)

This was then the formula I put in cell D5 and copied it across

=SUMIFS(D2:D4,$C2:$C4,">"&COLUMN(D1)-12-3)

The 12 is for 12 months and the 3 is for Column C where the data starts.

The return business is in D6 and across

=SUM(D2:D4)-D5