You can get rid of the additional self employment line by deleting the corresponding form that is attached to it. This is most likely Form 1099-MISC or Schedule C.
- Login to TurboTax Self Employed online
- Click Take me to my return
- In the upper right corner, click "My Account > Tools".
- In the pop-up window, select "Delete a form".
- Click "Delete" next to the form 1099-MISC and/or Schedule C affiliated with the wrong entry and follow the instructions to remove the form/schedule.