Lisa,
You're going to want to look into SIM federation. I don't personally use it but as I understand it, it is a way to link multiple SIM consoles for at least the ability to search for systems and events. I do not believe federated systems will forward events to a single console, but you can view them from multiple, in a single instance. It really depends on why you would need this - I assume due to size you need more than one CMS, and then an easier way to manage.
I will eventually look into this if we expand into a third console..
