Dinesh,
Try the Repository Navigator. SE84 > ABAP Dictionary > Fields > Table Fields. This is typically a thankless task, since most of the more popular fields exist in dozens and dozens of tables.
Normally, you FIRST determine the table and field of interest, and THEN you create your extraction. You determine the table and field by reviewing the business requirements. Typically, you can consult with a functional expert from the application area to assist you, since BW consultants cannot possibly be expert in all applications.
Best Regards,
DB49