title_body: how to extract specific tag using calibre
upvoted_answer: AFAIK, this can't be done automatically with Calibre. However, if it's possible to download parts of a website with a custom Recipe.
  
  If you're familiar with Python, you could also use BeautifulSoup to scrape websites. 
  
  For more information, see How to scrape websites with Python and BeautifulSoup.