You should not have to select itemized, TurboTax should recognize if your itemized deductions exceed the Oregon standard deduction. Your Oregon return will recognize that your itemized deductions are more than your standard deduction and generate an OR-A form in your Oregon return.
You can also look on your Oregon Form 40 and look at lines 16 & 17. Line 16 is the itemized deductions you recorded in your federal return and line 17 reports the Standard Deduction. Whichever line is largest is reported as a deduction on Line 18 of the Oregon Form 40.
How to get TurboTax to itemize deductions for Oregon when I take the standard deduction for Federal
