Distinct Values Sum

Dear Experts,

Needed Sum of distinct values in following query :

SELECT T0.[DocNum], T0.[ItemCode], T1.ITEMNAME, T0.[CmpltQty] FROM OWOR T0 INNER JOIN OITM T1 ON T0.ITEMCODE = T1.ITEMCODE WHERE T0.[PostDate] BETWEEN [%0] AND [%1] AND T0.[CmpltQty] > '0.00'

By this query data is retrieving like :

ItemCode,           Name,           Qty

1                         A                    10

1                         A                    20

2                         B                   15

3                         C                   12

2                         B                    20

It should be shown like :

ItemCode,           Name,           Qty

1                         A                    30

2                         B                   35

3                         C                   12

Any inputs are welcome.

Regards,

Ravi