I export the subtree, below is the org, and after that is the latex
===
* projects
:PROPERTIES:
:header-args: :cache yes
:EXPORT_DATE: \today
:EXPORT_AUTHOR: myname
:EXPORT_LaTeX_HEADER+: \usepackage{array}
:EXPORT_LaTeX_HEADER+: \usepackage{tikz}
:EXPORT_LATEX_HEADER+: \usepackage[margin=1in]{geometry}
:EXPORT_LaTeX_HEADER+: \usepackage{algpseudocode}
:EXPORT_LaTeX_HEADER+: \usepackage[extendedchars]{grffile}
:EXPORT_LaTeX_HEADER+: \usepackage[T1]{fontenc}
:EXPORT_TITLE: my title
:EXPORT_FILE_NAME: mypdf.pdf
:EXPORT_OPTIONS: H:3 toc:nil *:t ^:nil :t
:EXPORT_LaTeX_CLASS: beamer
:EXPORT_SELECT_TAGS: export
:EXPORT_EXCLUDE_TAGS: noexport
:END:
** Data
*** Test
**** Slide
- item
===
% Created 2015-08-06 Thu 13:20
\documentclass[presentation]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fixltx2e}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage{float}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{textcomp}
\usepackage{marvosym}
\usepackage{wasysym}
\usepackage{amssymb}
\usepackage{hyperref}
\tolerance=1000
\usepackage{array} \usepackage{tikz} \usepackage[margin=1in]{geometry} \usepackage{algpseudocode} \usepackage[extendedchars]{grffile} \usepackage[T1]{fontenc}
\author{myname}
\date{\today}
\title{my title}
\hypersetup{
pdfkeywords={},
pdfsubject={},
pdfcreator={Emacs 24.4.1 (Org mode 8.2.10)}}
\begin{document}
\maketitle
\section{Data}
\label{sec-1}
\subsection{Test}
\label{sec-1-1}
\subsubsection{Slide}
\label{sec-1-1-1}
\begin{itemize}
\item item
\end{itemize}
% Emacs 24.4.1 (Org mode 8.2.10)
\end{document}