Amend tax return

I normally have someone do my taxes so I thought this year I would do it with TurboTax.  Bought the Software, did my taxes, but did have my tax man do them as well and file them.  Thought I would check and see how close I was with  Turbotax to what he did.  After he did them I received another 1099 Int plus I disputed with him the sales tax deduction for the state.  I purchased a car so I had a big purchase so TurboTax gave me the normal deduction for state sales tax plus the large purchase.  My tax guy's software didn't give me the deduction for the large purchase.  I want to make sure I can take both and then and do an amended return.  Question 1 - Can I do an amended form using Turbotax even if I didn't file with  Turbotax.  Question 2 - Can I take both the large purchase sales tax deduction for Kansas plus the normal state sales tax deduction?