LIMIT or SL in long term

I have purchases ONGC at 168.10 few days back and its increasing on daily basis. But its down also in some days. I want to keep a check if my stock go below 163 then it should be sold automatically. Can you please guide me about trigger and option I should set for future.

Girish, all your orders are valid only for a day. In this case, you will have to place an SL order daily.