\documentclass[12pt]{article}
\usepackage{xcolor}
%\usepackage{xr-hyper}
\usepackage[bookmarksopen,bookmarksnumbered]{hyperref}
\usepackage{xbmks}

% just for laughs, we transfer the last section number from doc2
\setcounter{section}{4}


% the xr-hyper package may also be used if you have
% cross document links within the body of the doc
%\externaldocument[m-]{master}
%\externaldocument[d1-]{doc1}

\begin{document}

\section{Doc 2: Sec 1}

\belowpdfbookmarkx{Home page}[action={/S/URI/URI(http://www.acrotex.net)},%
  color=magenta,style={bf}]{home}

Some content goes here.

\newpage

\subsection{Doc 2: subSec 1}

Some content goes here.

\section{Doc 2: Sec 2}

\subsection{Doc 2: subSec 1}

Some content goes here.

\newpage

\subsection{Doc 2: subSec 2}

Some content goes here.

\subsection{Doc 2: subSec 3}

Some content goes here.


\end{document}