There is no way to access a form directly in TurboTax Online. The CD/Download TurboTax software that you install on a Windows or Mac computer has a forms mode that lets you access the forms directly. Even in forms mode, you cannot make any entries directly on Form 8606. All the entries have to be made on various worksheets that feed into Form 8606. But that might allow you to do what you are trying to do.
