Data Preperation : Multi-column handling

Hi All,

I have a query below :

Input:

Output :

when i tried using multi-row formula to compare and create a new field, I am getting a default value as 0.

Eg: IF [Col A]=[Row-1:Col A] THEN [Col B]=[Col B]+[Row+1:Col B] ELSE [Col B] ENDIF

Guide me how to work through it.

Thanks

Harsh