He will use his WA mailing address on his federal return. In MY INFO he will be asked if he made money in any other state, and he will say yes, and click that he made money in OR. When he enters his W-2 into the federal return, it will flow to an OR non-resident state tax return form. He will file a federal return and an OR return.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/state-taxes/would-file-nonresident-state...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/file-nonresident-state...
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