Click the Book Icon to save the book to your Zotero collection. If the saved information is not correct, please edit them manually. (For example, editors are saved as authors in this screenshot.)
Right-click the book that contains the book chapter you want to add in the Zotero application. It will show the drop-down menu.
Select "Create Book Section." You will see this newly created item accustomed to the item type "Book Section."
Modify the item information accustomed to the book section. It will be convenient to modify the information, because all the book information is preserved already and you will only need to add the title, the author, and other details of the book section here.
Press the “Enter” key or click the next field to save the information you added or modified.
Repeat #5 and #6 in each field that needs to update: click the field > enter the new information > press the “Enter” key to save the updated information.