Yes, you can link an IBKR account as an external account. Review our Users Guide for step-by-step instructions.
Additional Information
Can I link an IBKR account as an external account?
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Do you charge a fee to close an IBKR account?
Why are my external accounts missing in PortfolioAnaylst?
Can an account be part of multiple Account Groups for share allocation?
Can I link my ISA to an Introducing Broker?