If you have already filed your return, then you can amend it to add the sales tax deduction. But wait until the original return is fully processed. If
you had a refund/tax payment due wait until you receive the refund or the
payment is processed.
Regarding Sales Tax:
You have the option of claiming either general state/local sales
taxes or state/local income tax. In states that have a state
income tax, it is generally more advantages to take the income tax deduction.
You didn't indicate if you live in a state that does not have income tax. But if yours does, then TurboTax would have taken the state income tax deduction.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
If you have already filed your return, then you can amend it to add the sales tax deduction. But wait until the original return is fully processed. If
you had a refund/tax payment due wait until you receive the refund or the
payment is processed.
Regarding Sales Tax:
You have the option of claiming either general state/local sales
taxes or state/local income tax. In states that have a state
income tax, it is generally more advantages to take the income tax deduction.
You didn't indicate if you live in a state that does not have income tax. But if yours does, then TurboTax would have taken the state income tax deduction.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed