The best way to do this is by using a infomap as a middlestep to a report, there you can change the source (ex a olap cube) without any changes to the report. If you don't have a infomap, I think it's not possible sorry.
You could try using the export wizard from SAS Management Console to export the report. Then, re-import the report, specifying your new data source. Make sure you have a back-up of the report before trying this.