The best way to change BO layer (in B2B Java class)

Hi, mate:
One question, what is the best way to modify a business object.
For example: in B2B java, there is a class:
BidMgrImpl.java, however I want to modify some code for method Bid(),and for the action flow and JSP, I do not need to modify them.
I am looking for the simpliest way to implement this. instead of modify from JSP, to config.xml, action, and BidMgrImpl.java?
Cheers,
Eric

Hi, Prashil:
Thanks for your reply.
And a basic question, I am using NWDS now, and have none exprience of the tool.
I followed one PDF file(How_To_Create_Custom_App_ECO5200.pdf) to create my application(b2b_xyz), now I have three applications:
- LPJ_CRM_Db2b_xyzsap.com
- LPJ_CRM_Dcrmhomeshrext~sap.com
- LPJ_CRM_Dcrmisawebb2b~sap.com (this contains all JSP files under webcontent folder).
my question is if I need extend one class, where and how can I create:
for example in SAP application:
com.sap.isa.auction.businessobject.b2x.BidMgrImpl
In this class, if I need extend, what's gonna be the classpath, and where I can create this subclass.
Cheers,
Eric

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