\includegrahics[trim={<left> <lower> <right> <upper>},clip]{path-to-image}
\documentclass{article}
\usepackage{graphicx}
\begin{document}
...
\begin{figure}[...]
...
% trim 5cm from left edge
\includegraphics[trim={5cm 0 0 0},clip]{path-to-image}
% trim 5cm from right edge
\includegraphics[trim={0 0 5cm 0},clip]{path-to-image}
\caption{default}
\label{default}
...
\end{figure}
...
\end{document}