You need to use the show port capabilities to check QoS scheduling for each card you have.
Depending what you have, you can use
set qos map command to map Cos traffic for each Q.
CAT6500> (enable) set qos map ?
1q2t Port type 1q2t
1p1q4t Port type 1p1q4t
1p2q2t Port type 1p2q2t
2q2t Port type 2q2t
1p3q1t Port type 1p3q1t
1p1q0t Port type 1p1q0t
1p2q1t Port type 1p2q1t
1p1q8t Port type 1p1q8t
For example:
CAT6500> (enable) set qos map 2q2t tx 2 1 cos 3
If you have a different card, you would replcae 2q2t for the port type you have.