Venkat, did Rob's post do the trick for you? If so, please be sure you return to the thread and use the Accept as Solution button on his post to give him credit for the assistance and let other Community Members know that worked. If you have trouble marking things, you can leave a new comment confirming that did work, and I can circle back and mark it for you. If you still need help, leave us an update.
Here is a Design Blog on Mapping too that might come in handy, in addition to what Rob gave you already, further explanation on usage:
To help users find verified answers, please do not forget to use the "Accept as Solution" button on any post(s) that helped you resolve your problem or question. I now work a compressed schedule, Tuesday, Wednesday and Thursday, so those will be the days I will reply to any follow-up posts.