Hi Ajay,
That would be a heterogeneous system copy. You would use the software provisionig manager for that (SWPM). There are guides available that cover the (preparation) steps and those are specific to the OS/DB you are using, so there is not a single guide that covers all.
A good overview can be found here (also see the presentation): http://scn.sap.com/docs/DOC-34258
To find the guides you go to the SAP Service Marketplace: service.sap.com --> Products (at the top) --> Installation & Upgrade Guides --> SAP Business Suite Applications --> SAP ERP --> SAP ERP 6.0 --> Installation --> Then you see the copy guides at the bottom of the list
Regards,
Kim