Hi Ram,
I think you will find quite a many guides from SCN about how to do this.
Here's two links which I think will help you to do the splitting.
- http://scn.sap.com/people/claus.wallacher/blog/2006/06/29/message-splitting-using-the-graphical-mapping-tool
- http://scn.sap.com/thread/2072178
Cheers, Mika