Hi Rohit,
you can still use evdre reports in BPC 10, there is a separate migration tool that you can find under MORE on the EPM tab.
That tool does not however migrate an EVDRE report to a report that uses the new report editor in the EPM add-in. If you want to use the full capabilites of the EPM add-in you will need to re-create the reports.
BR,
Arnold