Can I have a trigger based order with a trailing stoploss?

Can I have a trigger based order with a trailing stoploss? For example a stock is at Rs 915, I want to buy at Rs 921 but only if it crosses Rs 920 and then trail the stoploss by Rs 1. Can I place a single order for this? Please Explain how

I understand that I can have a trigger based Buy / Sell using a stop loss order but I want a trigger based execution and a trailing stop loss.