I have a Single Member LLC that transitioned to an S-Corp in 2019 with the same name and EIN. What do I need to do to file 2019 taxes?

So just to clarify......there is no "manipulation". Not a good word in the tax world.

What is going on, is that you are removing the assets from Oldco and moving them into Newco.

In order to do that, you need to remove them from Oldco records within TT and this is accomplished as suggested earlier.

The assets no longer belong on your personal tax return since they are now part of Newco.

Having said that, I believe from your post you get the essence of what needs to occur. Assets are recorded and held with Newco.

*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.

Do you have an Intuit account?