How do I make and Interactive PDF change when the original document is edited?

I have an InDesign document that I would like to make into an Interactive PDF with sound clips for each page.

However, I don't want my original document to have the sound clips because it will be printed. So I think the only option is to make a copy of my original document, add sound clips, and then export it as an Interactive PDF? Unless there's a way to make it invisible on the document but visible when exported as an interactive PDF?

However if I make a new document, I want any changes I made to the original document to update automatically in the new document (with the sound clips). Is there a way that I can do this so that I don't have to make all edits twice?

Thanks,

Ruth