Hey Gianluca!
Sorry, I have missed your question.
In Portfolio EAs, we set the magic number as we want. It comes from EA Studio as 100. But you need to modify it when you trad it over the chart.
In the input menu, you will see the option to edit the magic number. It is on the bottom.
If you are trading with different Portfolio EAs, make sure to place unique numbers for the first 3-4 digits. The simplest way to go is to start with 100, 101, 102….and so on.
You can make your system. For example, use for EURUSD 100, 101, 102…, GBPUSD 200, 201, 202…
This way, you will recognize easier the strategies in the results after that.
Kind regards,