Naming Pages On a Background
Use the Book - Name Pages On Background tool to name all the pages on a selected background.
You can name all pages the same thing by leaving the extension field blank, or name them sequentially by entering a number or letter as the extension. The number or letter is then incremented for each page of the background.
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