Questions on displaying content from a topic on a book page and Project Manger vs. TOC

Just delete it from the Table of Contents. It won't remove the topic from the Project Manager pod.

Because you mention "Project Manager" I'm going to assume you're using Robohelp Classic. Could you please post back with the full version number of the version you're using? 

The following information only applies to Classic versions of Robohelp, not RH2019 New UI or later.

Project Manager is approximately a representation of the files on your hard drive. I say approximately because it includes some "folders" that don't exist on your hard drive. It also depends a bit on whether you have the project manager pod in "Project files" view or "HTML Files (Topics)" view. 

Your file structure on your hard disk does not need to match how you structure your content in your table of contents. In fact, mine never does, simply because some of my topics will exist in multiple places in the table of contents, but only one place on my hard disk.

Regarding your table of content structure, what you are saying is you want it to look like this in the output, correct? And when you click on Authors, you see the content from "Overview of Authors"?

- Authors

-- Author 1

-- Author 2

What you need to do is link the book to the topic. Right-click on the Authors book and select Properties. Tick the "Book with link" checkbox and select your topic in the Book Destination section. You can use the Find Topic button to search. You will also need to remove the "Overview of Authors" topic from the TOC structure.