You create a new topics in two places: In your project's Table of Contents (TOC) or the Project Files section. Creating a new topic in the TOC creates a TOC entry and a topic file and links the TOC entry to the topic file. Creating a new topic in Project Files creates a topic file without a TOC entry.
The instructions below explain how to create topics with TOC entries. See Creating new topics in Topic Files for instructions on creating topics without TOC entries.
If you save in compressed single-file mode (.hmxz) all your topic files are stored inside your compressed project file and can only be viewed in the Project Explorer. The Basic version of Help+Manual can only save in compressed mode.
Insert New Topic (Reference)