I want to buy any stock from NSE and want to sell in BSE and voice-versa. What to do.? Or Is it possible?

Well, place a buy order in NSE, wait for delivery of the stock to your DEMAT account which will be on the third working day of your purchase(T+2). Now sell those in BSE.

If you are thinking about arbitrage as I can guess from the tags, you can't do it manually. Inter-exchange arbitrage, in fact all kinds of arbitrage is for machines to do. You can't do it manually.

This is already answered, read http://tradingqna.com/355/could-equity-nse-and-sell-bse-any-special-approvals-required

Now big doubt is in my mine…Arbitrage is only for intraday or for delivery?