1.  Excel Application Scope (Activity) : In Properties, Enter the workbook path (Ex : "F:\UI Path Foundation Material\Files\sum of numbers.xlsx")
2. Read Range (Activity): In Properties,Enter SheetName = "Sheet1", Uncheck Headers if  column header is not given, Enter Output DataTable (Ex : OutputDataTable)
3. Assign Counter (Activity) =1
4.For Each Row (Activity) in OutputDataTable
          Read Cell (Activity): In Properties,,Enter Cell  = "A" + Counter, SheetName = "Sheet 1", Output result = "AValue"
           Read Cell (Activity) : In Properties,,Enter Cell  = "B" + Counter, SheetName = "Sheet 1", Output result = "BValue"
          Assign (Activity) CValue = AValue+BValue
          Write Cell (Activity): In Properties,Enter Range = "C"+Counter, Value = CValue
         Assign (Activity) Counter = Counter+1