Hello Pawan,
Actually in design phase, there are 3 main categories of inter-company process flows to consider :
- Inter-company Sales flow
- Inter-company Procurement flow
- Inter-company Financial flow
The pure financial flow is out-of-scope for processes involving MM/SD obviously.
For each flow, it is desirable to map the various business situations (e.g. company A sells to company B a product X or service Y) and to detail the various steps along with the key requirements (e.g. postings should made to account Z and cost object U).
The mapping of the business steps will eventually help to provide rationale to decide which SAP setup is the best in which situation. There are often several SAP solutions to cover inter-company processes.
Usually each flow is detailed in many "sub-processes". Also, in a design phase the number of steps "on paper" is not that critical because it is always possible to automate the execution in SAP via interfaces (idoc/webservices...) and other enhancements (provided that we are within scope and budget).
Regards,
Alex