Hi Praveen,
Is Document Management System ( DMS) has been implemented and configured in your case.
If yes, then you can assign documents to WBS elements in Project.
Search Documents topic on sap help.
To start with u can refer below mentioned link
http://help.sap.com/saphelp_46c/helpdata/en/95/5fdf348840ee64e10000009b38f83b/frameset.htm
Regards
Tushar
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