Near the end of your state interview, TurboTax should realize that you owe state tax. Are you sure that you owe Oregon more than $1,000? If you owe less, then the whole underpayment process won't appear.
If, by this point, you owe Oregon more than $1,000, on the screen "A few things before we wrap up your state taxes", look at subheading, "Other situations". Go down to "Underpayment Interest (Form 10)". Going through this sub interview while allow you to make the entries that you want.
If you don't see this entry to Underpayment Interest, then something about your return is blocking it.
For example,
1. Is your OR tax due less than $1,000?
2. Was the OR tax paid in 2024 greater than the tax due in 2025?
3. On the screen for "Underpayment of Estimated Tax Exceptions", you clicked on one of the exceptions to owing any underpayment penalty.
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