Dear all,

I would like to sum values that are in the same row but on different columns. For instance,

X1 X2 X3 Y1 Y2 Y3 Z1 Z2 Z3

1 a b c d e f g h i
2 j k l m n o p q r
3 s t u v w x y z @

So basically, I would like to sum row 3 only from s to @. I hope it is clear, thank you.

Best,
Jean