Deductions & credits

TurboTax will automatically give you the highest deduction, whether it is Sales Tax or State and Local Taxes.

If you have W-2s, generally State and Local Taxes is larger than Sales Tax (unless you bought a new car, maybe!). 

Type 'sales tax' in the Search area, then click on 'Jump to Sales Tax'.  If you have entered both, the screen asking which you want to take will come up. 

Click this link for info on Entering Sales Tax.