Please try this:  

Click on the Federal Taxes tab, then Deductions & Credits, then scroll down to Estimates & Other Taxes Paid and select Sales Taxes.

The first question you come to will ask you to verify the dates you lived in the State, then you will be asked your Sales tax rate, and the next question will ask you if you had any Major Purchases.  Answer Yes and follow the prompts.

Please note that taxes are limited to $10,000, so if you have already entered property or other taxes, TurboTax will limit your deduction to the allowed amount and may skip that section.

You can also just delete the sales tax question and then go back and answer yes to it, just starting from scratch with the question and it will take you through all the screens where you can enter the big ticket item.

I can't find the sales tax area for big ticket item.  Can you please indicate where I am to input the amount.  I did the IRS worksheet and came up with a different amount than on the return.

 Sales tax can be advantageous when you buy big ticket items. 

• Which deduction should I use, sales tax or state and local income tax?

1. Sign into your TurboTax Account
2. Deductions & Credits > Scroll to Estimates and Other Taxes Paid > Select Sales Tax
3. Alternately you can Search (upper right) sales tax > Click the Jump to ... Link
4. Continue to enter your sales tax figures 
   1. Select 'Enter all my receipts'