Sketcher > Working with Sections > To Exit Sketcher with an Incomplete Section
  
To Exit Sketcher with an Incomplete Section
You can exit Sketcher with unfinished sections by selecting Done from the Sketch menu. This creates an incomplete section, which you can finish later. A feature that has an incomplete section becomes an incomplete feature.
1. When you want to exit Sketcher with an unfinished section, click Done.
2. You are informed that the section is unresolved and asks you for confirmation to exit.