Hi Partha,
If I understood your scenario correctly, you have SAP BW in a HANA compatible release (e.g. 7.31 or 7.4) and you only want to migrate the database of the Production instance to HANA. I.e. all non-Production instances will remain on AnyDB RDBMS (e.g. Oracle).
I strongly doubt if this is a supported scenario by SAP and if that is wise to do. It will throw up crucial and severe limitations, apart from compatibility issues I cannot fully oversee.
It is a best practice and strongly recommended to keep all systems in sync re. BW release, SP level, DB release/patch level and OS release/patch level. Only then transporting objects can be considered as 100% safe.
Another aspect is the major changeover in functionality for BW on HANA. Think of the Eclipse based modeling environment, new InfoProvider types introduced in release 7.4, and so on. You will not benefit of any of those functionality improvements.
Last but not least, please involve SAP to discuss this scenario and ask if it will be supported.
Best regards,
Sander