Hi Surya,
datasource enhancement process depends from which type of datasource you are using...however, generally speaking, you have to go to RSA6, choose your datasource and enhance it by creating an append on the extract structure in which you can put your own additional fields (ZZ*)...then, after saving and activating, you have to fill these fields by a specific userexit (for transactional or master data) in CMOD (through the enhancement RSAP0001, you will have to access the function module EXIT_SAPLRSAP_00n and put your own code in the Z include)...
Let me know what is your specific need !
Hope it helps...
Bye,
Roberto
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