Yes, you can make corrections and report the correct cost and proceed amounts in TurboTax. Make sure you keep the documents on how you arrived at the entered cost and proceed amounts.
Yes, you can ignore JP Morgan's Form 8949. TurboTax will generate Form 8949 when you enter your 1099-B forms.
Please see Do I need to fill out or mail in Form 8949?
Additional information: Where do I enter or import a 1099-B?
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