I'm unable to delete a partnership from Partnership K-1 Summary under the State Taxes section

To delete it, please follow these steps:

In TurboTax, open your return
On the top of your screen click on My Account, then click on Tools in the small dialog box
On the Tools Center page, click on Delete a form
A list of forms will appear. Locate the Form K-1 Wks (name of entity) and click Delete next to it.
On the next screen, click Delete Form
If you see the Form K-1 (name of entity), also delete it. But remember to delete the worksheet (Wks) first.