Hi Valluvan,
As far as I know, SAP BW based Universe is not a supported Universe data source for Design Studio. We have to use OLAP connection for the same. If you have build Dashboards built on Universe then we must know that according to SAP xcelsius is a dying technology.
If we are looking to migrate to Design Studio for performance reasons we should look at using OLAP Connection which performs better compared to Universe when used in other BOBJ tools.
Hope this helps
Regards
Vaibhav