The August issue of the Annual 2012 contains an extensive documentation and tutorial of the Cut functionality that is included, but normally hidden in CC3. It allows you to cut out and enlarge portions of existing maps into detailed sub-maps.
The included mapping guide takes you through the process of creating such a sub map step-by-step, discussing such topics as rescaling and adding symbols, breaking up multipolies and resizing bitmap fills to suit the new scale.
The tutorial pack Cutting and Exporting Map Parts includes