TurboTaxIrene, I have already followed the steps you have mentioned & not once but at least 4 times. S-Corp comes back when I try to add K-1 for Partnership.

[IreneS]

You want to keep the K-1P, right?

[IreneS]

I'm sorry -- I know this is frustrating.

If you haven't entered anything in that S-Corp K-1 screen, let's back out and see if there is a K-1S in the Delete Forms screen.

1. While in your return, click on Tax Tools > Tools (in the black bar at the side of your screen). 
2. Under "Other helpful links" click on Delete a form. Click Delete next to the K-1 S and follow the onscreen instructions.
   
3. Also look in the state section and delete that K-1 as well.
4. Once you have finished deleting the desired form(s) click the Continue with My Return box (in the lower right of your screen).

[VolvoGirl]

Or Try deleting it this way.  Go to the K-1 interview section here
Federal
Wages and Income
Then scroll way down to Business Items
Schedules K-1, Q - Click the Start or Update button

If the first screen says "Do you want to review Schedule K-1?". You have to answer yes and then click Update by  the Schedule K-1 type (LLC, S corp, trust). The next screen is the Summary screen listing all of the K-1 entered for that type of entity.  You can review, edit or delete it there.