Naming a Range of Pages
Use the Book - Name Pages tool to name a range of pages.
You can name all pages the same by leaving the extension field blank, or name them sequentially by entering a number or letter as the extension. The number or letter is incremented for each page in the range.
Note: you can collapse this dialog by clicking on the collapse graphic () at the top of the screen and then expand it again by clicking the expand graphic ().
Click on the screen elements for details.
Base Name field
Name Pages button