Hey SB,
Not sure this can be done, to be honest, as a VM would show up all port groups it is entitled to. Now that I think of it, perhaps creating two different clusters seggregating the production and test/lab set up might work as you would not be able to connect a VM across a cluster to a portgroup on a host.
Names would need to be different though else you might see similar names across clusters though the port groups might be two different entities altogether. Apart from this, can't really think up any scenerios wherein a portgroup would not show up on a VM if present on a host
Regards
a