My version is 220.127.116.11
I have several projects and finally merge them.
To link a heading of a topic in a project, say project 1, from some where in a topic of another project, say project 2, I bookmark a heading in project 1 and then in project 2 I inset link to that bookmark. Having done that, two things happen:
A) All headings in project 1 are bookmarked automatically and the one I did manually, gets another bookmark. For every link to a bookmark in project 1 form another project, a new bookmark is added to all headings in project 1. It does not happen if link to a bookmark is done from the same project, as it is supposed to be the case.
B) I Insert Topic TOC in every topic and set it from heading 2 to 2. When I open project 1 in design view, all heading 2 are shown beneath Topic TOC, but it is not shown in preview of project 1. When I generate output, Topic TOC is shown in project 1.