If you want to change the column then you need to change or make dynamic the Q value and not the number after Q
use the same approach on index…but instead of using index value for number after Q use it to change Q
so your cell value would be UiPath.Excel.Helpers.ExcelUtilities.ConvertColumnIndexToColumnLetter(index + 17) + "3"
here assumption is your index starts from 0 so added 17 which represents Q…and row value I used is 3…
Hope this helps
cheers