How can I create a online collaborative document where I only allow certain users to edit certain sections?

Question

I want to create a online document that can be shared with many different users but I only want those users to be able to edit and view certain sections. The hard part is I want it all to feed one document and I want the ability to give different users access to different sections of the document. My first though was using multiple Google Docs but that fails because I can't feed all those documents up into one (at least that I know of).

Answer 1

At this time is not possible.

References
How to share - Google Drive Help