Setting a trigger price for buy order

Buying stocks at a price lower than LTP is easy…you just have to place an order at your desired price and forget and it is not executed until that level is reached. What I want to do is reverse. Say a stock is trading at Rs 100. I want to buy it only when it goes above 105. How do you set an order for it and forget? Is there an option to place a trigger price for price level above LTP?

You could look SL order explained here. Choose the trigger price as 105 if it is for the above example.