Trailing stop for all existing trades on condition

[BlueMoon]

What is the best way to achieve the following:

I have many trades open. Some using EA, some manually opened. I would like to trail Stop loss with the following condition and with the following method:

Condition:
Apply trailing SL only if the trade has reached profit of 50 pips.

Trailing Method:
Once my trade has reached 50 pips profit, the SL should be set to 10% less which is 45 pips in this case. Keep trailing this on every 1 pip price movement in my favor. I mean if the trade is now making 51 pips profit...then the SL should be set to 10% less which is at 5.1pip, which is at 45.9 pip....and so on........

[fxDreema]

Just use the Trailing stop (each trade) block. There are many options inside, one of which is for something that I call Trailing Start. This is where you can write this offset of 50 pips, so no trade will be touched until 50 pips of profit is reached.

Set Trailing Step to 1 pip.

And for Trailing Stop you have the option to use % values. You can see you have "% of Profit" option and also other options.