One way to go about the problem would be to use DataTable. So you first read your Excel file by using an Excel Application Scope activity with Read Range, then for each row read, you use an Assign activity to get the sum of row(0) and row(1), the values of the first and second items in the row, and save it to a variable; lastly, write the value in this variable back to the Worksheet at the next column at ("C" + rowNumber) e.g. C1, C2, C3. hope this helped