% Test file from Stephan Haller <stk@snafu.de> that shows how
% bookmark open levels can vary during the document.

\documentclass{article}

\usepackage{times}

\def\OpMode{1}  % fake vtex

\usepackage{hyperref}

\begin{document}

\section{I'm closed (default)}
\subsection{x}

\hypersetup{bookmarksopen=true}

\section{I'm open,}
\subsection{and so}
\subsection{are my}
\subsubsection{children}

\hypersetup{bookmarksopen=false}

\section{I'm closed,}

\hypersetup{bookmarksopen=true}

\subsection{but my}
\subsubsection{children}
\subsection{are}
\subsubsection{open}

\hypersetup{bookmarksopenlevel=2}

\section{level is two now}
\subsection{so this is closed}
\subsubsection{y}

\end{document}