From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric S Fraga <e.fraga@ucl.ac.uk>
Subject: Re: How to export an Org file to LaTeX's book class, but without
 parts?
Date: Wed, 22 Apr 2015 07:15:27 +0100
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References: <87mw21w1qj.fsf@mbork.pl>
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To: Marcin Borkowski <mbork@mbork.pl>
Cc: Org-Mode mailing list <emacs-orgmode@gnu.org>

On Wednesday, 22 Apr 2015 at 00:33, Marcin Borkowski wrote:

[...]

> I want to export my Org file to the book class (actually, a class
> similar to it, but never mind), but I want my first-level headings to
> be chapters, not parts.  OTOH, I don't want to modify
> org-latex-classes.  Is that possible, and if yes, how to achieve that?

The easiest way is, unfortunately, to modify org-latex-classes but the
modification is simply adding an element to the list:

#+begin_src emacs-lisp
  (add-to-list 'org-latex-classes
               '("bookwithnoparts" "\\documentclass{book}"
                 ("\\chapter{%s}" . "\\chapter*{%s}")
                 ("\\section{%s}" . "\\section*{%s}")
                 ("\\subsection{%s}" . "\\subsection*{%s}")
                 ("\\subsubsection{%s}" . "\\subsubsection*{%s}")))
#+end_src

or similar...
-- 
: Eric S Fraga (0xFFFCF67D), Emacs 25.0.50.1, Org release_8.3beta-1030-g65bbb1