Adding up to four NICs is supported in CMS 2.2+. In VMware the NIC must be of VMXNET3 type, otherwise licenses will be invalidated.
Each additional NIC represents an interface in CMS. Interface a = vmnic0, b=vmnic1, c=vmnic3, d=vmnic4.
NOTE: No two interfaces on the CMS can be connected to the same subnet.
Have fun!