At the simplest level, building a PBB is accomplished by building a web page. In HTML there are headers (H1, H2, H3, H4, H5, etc). These headers are what create “Books” and “Chapters” in your PBB book. You can use any HTML editor to build this page, include Microsoft Word or OpenOffice Writer. Just save to HTML.
Then in Libronix you go File/New and create a “Personal Book.” This will create a folder. Copy your HTML pages into this folder and then go back to your Libronix “Personal Book” and click Discover. Then click Compile. You now have a PBB file.