For InDesign 5.5, I have an interactive PDF (not movie, user can interact using Acrobat Reader) that I want to place into a new InDesign document then add text (using InDesign) and finally PDF the InDesign document that still retains the capabilities in the initial interactive PDF. How can I do this? Any insight is appreciated.
It won't work. Once you place the PDF into InDesign, it loses its interactivity.
You could use Acrobat to merge an interactive PDF with a separate PDF you created in InDesign, and it would keep its interactivity.
Or, you could return to the program that created the interactivity, and add the text there.