@l-andorrà Thank you very much!
So what your saying is that the first step in my EA construction is to begin with an indicator.
What do you mean by "custom"? doesnt exist and indicator that relates diferent pairs?

I want to know if it is possible to do in FXdreema (and how to do it to) an EA that can identfi when three or more pairs are correlating (EUR/USD, GBP/JYN, AUD/USD for example) and use that to trigger operations on that specifics pair?
Should identify if it negative or positive correlation.