With RPE 2.1 Document Builder (Web Services), you can duplicate an existing report to create copy of it and then modify the report as needed like add or remove a template, output formats, etc. Find more details here. Note that the report configuration like data source to connection association, variable values and any other report parameters will not be copied.
For a data source connection, credentials and other parameters could be same for most of the connections apart from the URL. Hence, a report designer could now duplicate a connection from RPE 2.1. Check here for the exact steps.