Hi Burak,
I am not sure if such a feature is included in standard ALV.
One alternative solution is you can 'manually' add and find subtotal.
Then append that as a row into a 'new' final output table, with all column values blank except subtotal value under the particular columns.
Then you may colour that particular 'cell' using standard ALV colouring technique.
Regards,
Nisha Vengal.
