You can import PDF bookmarks as single songs easily by clicking Import > PDF bookmarks.
If you have pdf books without bookmarks you can use the Snippet Tool (see p. 93 of the Manual), you can manually add bookmarks to the PDF first, and then import it, or you can create an associated CSV file for that PDF (see p. 36 of the manual).
If you have pdf books without bookmarks you can use the Snippet Tool (see p. 93 of the Manual), you can manually add bookmarks to the PDF first, and then import it, or you can create an associated CSV file for that PDF (see p. 36 of the manual).