Show parts of an Adobe Sign form based on a selection

In Adobe Sign (web form) how do you show a a section containing field labels and fields, based on a selection. As an example if 'Applicant 2' radio button is 'Yes', then show the Applicant 2 column inluding headings, field labels and fields. I have seen this in Acrobat using layers but my understanding is that Adobe Sign flattens the pdf, which would remove the javascript.