Total for invoice wise material

Hi All

I Have following internal table,

VBELN matnr qty

1000005 m1 5

1000005 m1 3

1000005 m2 2

1000006 m2 5

Requirement is :

1000005 m1 8

1000005 m2 2

1000006 m2 5

How i can do this.....

Rgds

pp