If you want to attach forms, like 4797 generated elsewhere, then all bets are off. TurboTax needs to do the work, based on your interview responses.
BUT
If you want to enter your tax form data manually, then you can do that in FORMS mode. You will have to file a paper return via US Mail. You can't paste a tradelog 4797 into a TurboTax electronic file. I don't think any tax preparation software will do that.
