Hello Mahesh,
If I am not mistaken, you are refering to billing which is done out of the SD component of R/3. If that is the case, you can find lots of documentation on the different R/3 components on the website http://service.sap.com. It contains the complete manuals to all the SAP R/3 product components. It also contains information on the SAP NetWeaver stack which is what we support on SDN such as the SAP Enterprise Portal.
Regards,
David
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