Yes, using the "Other reportable income" topic under the "Less Common Income" section does allow the taxpayer to remove income items by entering a negative number. Your form 8833 should support that treaty based adjustment; be sure to identify the adjustment reference.
Further, you are correct you will need to download the form 8833 from IRS.Gov complete it and attach it to your printed/completed return to mail in to your IRS Service Center.
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