Is it possible to start a new Case / Process Instance from inside another Process

Hello
I am planning to Integrate 2 processes in BPM.
At the last task of Process 1, when user clicks on Submit, it should start a new Case on Process 2 with Inputs from Process 1.
Basically start a new Case of Process 2 when process 1 ends.
What would be the easiest way to implement this.
I understand, Using a Sub process idea can work.
Calling Process 2 as a Subprocess of Process 1.

Is there another way of doing this ?
All Ideas are welcome.

Thanks in Advance.