title_body: how to create hypertext local to an EPUB document?
upvoted_answer: I don't really understand the question, but it is possible for an epub file to contain html files which do not appear in the main navigation document. They can be accessed indirectly through hyperlinks within the HTML document. 
  
  See the answer I gave for a different but related question here: https://ebooks.stackexchange.com/a/7211/417
  
  By the way, if that is your question,  I recommend ignoring the epub2 way to do it and just do it the epub3 way. A lot of reading systems (including the Kindle ones) are ignoring the toc.ncx document if you have a &lt;nav epub:type="toc"&gt; element.