where in turbo tax do I find tghe question about major purchases

For sales tax?

SALES TAX

You can enter the sales tax you paid in 2024 by going to Federal>Deductions and Credits>Estimates and Other Taxes Paid> Sales Tax.  

Sales tax is an itemized deduction.  Unless you have enough other itemized deductions  (such as mortgage interest, medical expenses, charity donations....)   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

You may be referring to the question in the sales tax section so that you can enter sales tax for a large purchase.

Follow the instructions in the TurboTax help article below:

Where do I enter my sales taxes paid?