Hi there izsanni,
It's vital that all your income be entered correctly for your forms to be accurate. QuickBooks Online Accountant has the Pro Tax feature in order to help you file your client's taxes. I can point you in the right direction for assistance with entering income.
For help with entering foreign income, I recommend reaching out to the Pro Taxsupport team directly outside of the Community. They'll be able to best assist you in entering this income so it will be reflected properly in your forms. You can reach them using the chat link here.
If you haver any other questions, feel free to reach out here.