I deleted line of work in the self employed work summary how can I get that line back

[TomK]

1. With your return open, Search for "sch c."  
2. Click on "Jump to sch c" link.  You should land on "Your 2018 self-employed work summary" screen.  
3. Click on "Review" box next to your business.  
4. Edit "General info".

Please see screenshots below.

[jenlampton]

This allows me to change the current entry, but does not restore the previous year's values. Would the "Clear & Start over" option bring back everything entered the previous year for the Line of work?

[DawnC]

Yes, clear and start over is what you need.  @jenlampton