Where do I show tax free disability income?

If you have tax free disability income, you don't have to report it on your tax return.

I know i don't have to report it but it will increase my income and will also increase my state sales tax deduction  i have seen that it comes from Schedule 1. Whefe can i find that form?

When you go through the sales tax routine in TurboTax, you will be asked to enter Non-Taxable Income. That is where you can enter your disability income if you aren't required to enter it elsewhere because it is not taxable.