Hi Venu,
Check as above experts advice. If you still really want to copy the data from QA to PRD.
Ask Basis team to link QA to PRD(source system assignment and connection), I mean connection to load data from QA to PRD. Then ask BW consultant to create BW objects (Datasource, Transformation,...) Later you can load from QA to PRD.
Even vice versa can also be done, i.e load data from PRD to QA.
Hope it gives idea!
Thanks,
Umashankar