You can delete your state return in TurboTax Online as long as you haven't paid or registered yet.
If you don't see the option to delete your state (you'll probably see Edit instead), you've already paid your TurboTax fees (including the state fee) or registered your free version while the state was on your return. If you've done either of these things, you can't delete your state return.
I have already paid the turbo tax fee so cannot delete it. How can I get my fee back and delete that state since I don't need to file?
Unfortunately, you will not be able to delete your state return if you have already paid your TurboTax fees.
You can contact customer support to request a refund by clicking here.