Custom Fields With Options
Custom Fields of types Drop Down, Radio Buttons, and Checkboxes allow you to set options to choose from.
Here's an example. Let’s add an age level field. Go to the Custom Fields Settings Page.
Make it a drop down field. Save the changes.
Now you’ll see a new tab for age level. Every field that has options will create a new tab where you can set those options.
Click on the new tab. Enter each option you want included for this field. You can also reorder the options so they appear how you want them.
Go back to editing the book. Now below the trigger warning field there is an age level drop down. Choose an option and save.
The field shows up in the box of additional info under the summary. If the field is a checkbox with multiple options selected, they will be listed in a comma-delimited list.