cTrader trading platform lets you login to multiple trading accounts at the same time. So logging in to all of your trading accounts on your platform is a one way to do this.
Alternatively, you can also create a “cTrader ID”(or cTID), so you can link all of your trading accounts and access to all accounts at the same time just by logging in once with your cTrader ID.
To create a cTrader ID, go to “Sign in” and click on “Sign up” at the bottom of the window as below.
Now login to cTrader platform with your “cTrader ID”, then login to all of your trading accounts after. This will automatically synchronize the accounts and link them all.