Satellite 6 with Multiple Subscriptions

I have several subscriptions with RH that were purchased separately and therefore have differing contract ID. In an effort to simplify management, I added all of these contracts to an activation key so I would have a 'pool' of available subscriptions. However, when I register a new host, it ends up consuming 1 subscription from each contract. Is this the intended behavior? Do I have to create duplicated activation keys for each contract or can I pool them together and I'm just missing some aspect.

Any help would be great!

Thanks,
Gary