How to extend an AM definition provided OOTB in a product

Hi,
I have a requirement to extend functionality of an OOTB application module, which is delivered as a part of a product. What is a safe way to replace this AM definition, with an extended version (say, adding a few methods to the AMImpl class) so that it survives and absorbs patches.
To briefly explain using an example: All application modules in the product are nested under 'SessionAM'.
oracle.apps.abc.common.SessionAM
--> oracle.apps.abc.sr.ServiceRequestAM, with various VO definitions included and ServiceRequestAMImpl as implementation class.
--> oracle.apps.abc.order.OrderAM
I need to customize 'ServiceRequestAM' by adding a new method to the 'AMImpl' class. I also need to expose this method in the Client infterface.
Couple of ways I can think of are:
a) Create class 'MyServiceRequestAMImpl' by extending 'ServiceRequestAMImpl' and edit ServiceRequestAM.xml outside Jdeveloper to replace the class definition. I can't figure out how the changes to the client interface can be patch-proofed.
b) Copy the whole AM (oracle.apps.XYZ.sr.MyServiceRequestAM) and extend it. Change SessionAM.xml outside JDeveloper to replace the child AM path. But I would be copying the AM definition, only to extend the Impl class.
Is there any other way I can do this, declaratively?
TIA
Regards
Deepak.

Hi John,
Excellent pointer. Thank you very much.
I didn't know AMs could be substituted, although I'd seen the option to substitute VOs.
Found this link on doing that in OAF: http://oracle.anilpassi.com/oa-framework-extension-of-am-steps-how-to.html
I am using ADF, on JDev 10.1.3.3, but that was easy to locate in JDev.
- Created my custom AM, as an extension of ServiceRequestAM
- In my 'Model' project properties, created a substitution for ServiceRequestAM with MyServiceRequestAM.
- Custom method added to 'MyServiceRequestAMImpl' and exposed in client.
Cheers
Deepak.

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