I had no problem with going to the "Other Oklahoma Credits" page and clicking "Update" under the Credit for Employees in the Aerospace Center. I then put in the dollar amount for "Credit Established During Current Tax Year" and "Unused Credit Carried Over from prior Year", no problem.
But the instructions say, "Be sure to include a copy of Form 564 with your return." So I downloaded and filled a pdf copy of Form 564. But WHERE should I attach Form 564? I don't see anywhere where I can attach pdfs.
TurboTax does not currently support pdf attachments for Oklahoma electronic returns. If a return contains any forms that need to be attached for supporting documentation purposes, they should be mailed to the Oklahoma Tax Commission along with Form 511EF. This information is included in the electronic filing instructions under "What You Need to Sign and Mail".