Since I want only the document map, not the table of contents to be part of the book document at this time, I didn't save the changes to the book document that created its table of contents. Currently, the table of contents is indeed absent from the book document when I load it anew (since it never got saved in the first place), but it still appears in the prospectus right where I pasted it. So did the above process un-link it somehow?

Interestingly, the full table of contents now in the prospectus gets selected when you click on any part of it, and a Ctrl-click link 'invitation' appears in a screen tip. However when you Ctrl-Click it, it takes you to the top of the prospectus document, and does not complain that it can't find the book document where the table of contents was initially created.

Also: Now that I have the table of contents of the book in the other document, is there any way I can change its status to simple text, so that it is not immediately selected in its entirety when one clicks on any part of it?