See the Understand the Structure of Texts guide

  1. Open your text

  2. Find the section of text for which you want to create a child

  3. Click on the plus sign

  4. Type the new section's title in the "Title" field

  5. Type the new section's content in the "Content" box

  6. To add metadata to the section: 

  7. Click Book outline

  8. Verify "Book" and "Parent item" 

  9. Click on the "Weight" drop-down menu

  10. Choose the importance of your section relative to sibling sections

  11. Click Save