Once the Dynamic Group are created, you can apply them in defining:
Classic Mode: An Access Rule on the POLICY | Rules and Policies > Access Rules page. For more information, refer to Configuring Access Rules section in SonicOS 7.1 Rules and Policies Administration Guide for Classic Mode.
Policy Mode: A Security Policy on the POLICY | Rules and Policies > Security Policy. For more information, refer to Security Policy section in SonicOS 7.1 Rules and Policies Administration Guide for Policy Mode.