Navigation ADMIN > SUPPORTING DATA > CUSTOM FIELDS > Click on a Customizable Type > Then click on a Page > Then click on a Section > Then click on a Field or create a new one > Then select the "Choice" Field Type.
Field Type: Choice
A “Choice” Field is one where the input options are limited to a series of preset “Choices” which you can define. Any "Choice" Field can then be presented as either a
Multi-choice Drop-down List
Multi-choice Radio Button Array
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How to configure you “Choice” Field with a drop down list.
How to configure your “Choice” Field as a “Radio Button Array”.