What i would like to do is that if i have multiple rows with the same value in column 0, 1 and 11, it will leave all cell populated as it is and also add the letter "H" in column 4 of the first row only.
Then, it will empty the value in column 3 and add the letter "D" in column 4.
Example of the grid before the macro:
Then after the macro:
What would be the best way to do that as i can have up to 7000 rows in the grid.