Club multinple rows into single row in an internal table

Hi Gurus,

I have final internal table gt_final like below

Material    Batch     Reason     Quantity

503          Batch1    A                100

503          Batch1    A                 200

503          Batch1     Q               85

503          Batch1     Q               75

503          Batch1     B               75

503          Batch1     B               75

Here reasons,  A = Unrestricted Stock, Q = Quality Stock, B = Blocked Stock.

Here I need to sum the quantites based on the batch and reason, that means I need to display in output like below

gt_final is the final internal table.

Material    Batch     Reason     Quantity

503          Batch1    A                 300

503          Batch1    Q                160

503          Batch1    B                150

Please guide me on this.

Thanks and Regards,

Muralikrishna Peravali