That feature does not yet exist in InDesign.
You can design it in ID and then run the form field recognition feature in Acrobat Pro.
Thanks Bob for the quick reply. Is there a button behavior that would display the additional content on click.
Or the ability to duplicate content within the pdf. such as
(add new) when clicked a new set of fields appear
Currently all you can do in InDesign is to create object which Acrobat's Form Field Recognition feature will convert into Text fields, Checkboxes, radio buttons, etc. All of the work currently has to be done in Acrobat.
Here is a link to an Adobe TV video which shows Form Field Recognition: Acrobat: Running Form Field Recognition | Accessibility @ Adobe ...