Reuse existing interfaces

Hello experts,
Could someone please help me understand what the best approach would be to reuse existing interfaces.
For eg: I have a FIle to iDoc scenario. Now I would need to create another scenario say for eg; File to web service.
How best can I make use of the File side development which I am already done with.
I am a newbie trying to learn PI. I am on PI 7.1 EHP1.
Thank you.

Scenario: We have three different interfaces.
a) File to File
b) File to web service ( Sender interface is similar to Sender of (a) )
c) web service to File ( Receiver interface is similar to that of (a) )
I will be creating 2 SI's. Each for Inbound and Outbound.
There will be one BO ( I am assuming this to be PI )
SI - Inbound will have two operation's, one for file and the other for web service.
SI - Outbound will have two operation's, one for file and the other for web service.
The number of SI wil depend of the kind of data to exchange. if those interfaces dont have nothing in common (data) yuo will have to define
2 outbound SI for file and another for web services.
now, the first two file exhange common data ( data concerning customer) you can define 1 SI_customer with two operation and another SI for the web services and another for the inbound file structure (scenario c)
when modeling will depend as i mentioned before of the kind of data.you wil define 2 models (one for interface a and b) and a second model for your interface WS-File(c)
take a look to this presentation:
PI Best Practices: Modeling
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/303856cd-c81a-2c10-66bf-a4af539b8a3e?quicklink=index&overridelayout=true
if it is no clear let me know
Edited by: Rodrigo Alejandro Pertierra on Sep 24, 2010 12:18 PM

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