Yes, you can place the stop loss but the order will be valid only for the particular day. If you have bought some shares at 200 for delivery and on T+2 (or days after T+2 ) you decide that if the price comes below 180 then you would want to sell it. So, you can place the stop loss for such a situation but the order placed will be pending till the market closes and in case the price does not reach 90 on that particular day then it will get canceled. Next day if you decide again to keep stop loss at 90 then you would have to place a stop loss order again.
But, if you have purchased some shares at 200 on some particular day, then keep a stop loss at 180 the same day and if it has triggered then that transaction would be considered as an intra-day transaction.
Then suppose i buy a stock at price rs 200 as cnc type. and stop loss 180.On that day any how the price of the share fall to 180. Then what will happen as the share till not creadited to my demat account as it takes t+2 day?