processes

I have a process like this:
PROCESS 1
Start -> Throw Message -> Catch Message -> Task1 -> end

And another like this:
PROCESS 2
CatchEventStart -> Task12 -> ThrowEventEnd

So "Throw Message" sends a message to "CatchEventStart" then ** "Task12"** does something and in the end "TrhowEventEnd" **send a message to ** "Catch Message"

I have a diagram with multiple processes within it (these diagrams have interdependencies: call activities, throw-catch message mechanisms). I want to split this single diagram (that has multiple processes within) to multiple diagrams (each containing a single proces).