Yes you can. Forex Tester allows you to open any number of charts for any currency pairs after you download the data and create a project.

Follow the instructions below if you have Forex Tester 3:

1. Click the Data Center button → Select the currency pair(s) → Click the Update from server button → Update.
2. Create a project through the File → New Project menu or use the “New Project” button on the Main Toolbar.
3. Click the Start Test button.You can also learn how to download the data on the Importing data page.

In case you use Forex Tester 2, please do the following:

1. Click File → Data Center → Update from server to download the data.
2. Open File → Generate Ticks → Select the time period, currency pair(s) and generation method → Generate.
3. Switch to Testing Mode (click the History Mode button in the top left).
4. Click the Start Test button.

The charts for these pairs will be moving simultaneously.
If you have not updated/imported the data, you can't open the charts for these pairs in the program at all.