All of the shipped report types and report samples are provided in internal form in SAMPLIB. The report generator manages the provided types and samples along with all your own customized reports and JCL and enables you to generate and run the JCL for the SAMPLIB reports. The report generator also enables you to customize or copy a sample for your own use. During the report generation an extract or a conversion step can be optionally added. The extract JCL skeletons are provided in DGTSLIB. You can modify a shipped skeleton by copying it to a pre-concatenated ISPF skeleton library (ISPSLIB allocation). To use different skeleton JCL for your customized reporting you can modify existing reporting tool definitions or by adding new reporting tool definitions.