As far as I know, there is no way to globally set-up the bookmark options for sections only. If I am wrong, what is the correct way to have sections (only) with respective blue bookmarks? It can be done manually but it is quite tedious.
\documentclass{book}
\usepackage[utf8]{inputenc}
\usepackage{xcolor}
\usepackage{times}
\usepackage{bookmark}
\begin{document}
\bookmarksetup{level=section,bold,color=blue}
\chapter{chapter}
\section{section}
\end{document}
The level=section option above is wrong but somehow describes what should be achieved: blue section bookmarks.

hyperref? Also, what specifically do you mean with "globally set-up the bookmark options for sections only"? Perhaps you can add a mock-up done with Word? – doncherry Sep 30 '12 at 01:45