I got a requirement from the client to add a pivot table extension in a QlikView and it's a very urgent requirement from them. And Pivot tables header can be drag and drop like this URL.
Ankur, below is the Help link for Extension development, best I have for you, generally this would be something you would contract with a partner that has experience in development of extensions to do for you.
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.