Trading tools - curl stop?

[9green9]

Hi There,

I'm pretty new to the trading scene, I have been doing some research into a trading tool/technique I have been trying to use.

I have been told that what I am trying to achieve is called a curl stop? and can be achieved on MT4/5 by using a flag?

basically I was looking for a way to automatically create an order for once a certain priced has been reached.

For example;

If AUDUSD was trading at 0.7218. 

And I wanted to create a sell limit at 0.7230. 

but I didn't want the trade at 0.7230 to become active until the price went past 0.7230 therefore catching it on the way back.

How would I do this? on MT4 or 5?