...
interface gigabitethernet 1/0/8
switchport mode general
switchport general allowed vlan add 8563,68 4 tagged
selective-qinq list ingress override_vlan 3 ingress_vlan 856
selective-qinq list ingress override_vlan 4 ingress_vlan 68
selective-qinq list egress override_vlan 856 ingress_vlan 3
selective-qinq list egress override_vlan 68 ingress_vlan 4
exit
...