Which screen are you looking at when you are clicking on the vLAN?
A vNIC is associated with a service profile. If you go to a service profile, then go to the vNICs tab, then use the [+]Add button at the bottom to add another vNIC. You can then pick which vLAN you want on that vNIC, or you can enable trunking and device which vLANs you want to pass down the trunk. You can also [Crate VLAN] from there as well.
Rodos