Creating Multiple Player Groups

Sorry if this has been asked before; I'm new here. Looking around to see if Roll20 will work for our group (and finding myself impressed). Anywho: is there a way to create multiple groups of players, and have them on different pages? aside from creating two separate campaigns. And a similar question: say 3 people roll a spot check to see an enemy; two of them make it, the other fails. Is there a way to determine which players can see an object? And if the answer is "no," but someone has run into this in the past, I suppose you could mention how you finagled it. Again, sorry if these have been asked; they probably have.

I just found the answer to the first question on an older post; second question still stands.

They making an update (Rugged Reroll), that will allow you to split the party and many other features (like auto measuring travel distance). I believe some of them are available for mentors at dev server.