You are posting your question from the Free Edition which does not support itemized deductions. Before you enter sales tax for a car, understand that will trigger an upgrade to a paid version of the software, and unless you have other itemized deductions like mortgage interest, sales tax will have no effect your refund or tax due.
SALES TAX
You can enter the sales tax you paid for the car you purchased in 2023 by going to Federal>Deductions and Credits>Estimates and Other Taxes Paid> Sales Tax. You will be asked if you paid sales tax on a major purchase, and you will be able to enter the sales tax you paid for your new vehicle.
Sales tax is an itemized deduction. Unless you have enough other itemized deductions to exceed your standard deduction the sales tax will have no effect on your tax due or refund.
“Major purchases” that you can enter for the sales tax deduction include:
Motor Vehicles (cars, trucks, motor homes, RV’s, sport utility vehicles and off-road vehicles
Aircraft or boats
Mobile homes
Manufactured housing
Building materials for major home improvements
You cannot deduct: furniture, jewelry, home electronics such as TV’s or computers
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States with no sales tax: Alaska, Delaware, Montana, New Hampshire and Oregon