Dear Sridhar,
Since you want to have Output of materials at 4 different stages, then below points to be done
- You have to create 4 Order Types for each Work station.( ZP01, ZP02, ZP03, ZP04..etc)
- You have to create 4 different BOM and routing for each stages.
- Each stages needs to be confirmed so that preceding stage output becomes input for succeeding stage.
If you want to have 4 stages to be encapsulated in 1 order Type with 1 BOM and with 1 Routing, then you may use concept of Phantom Assembly to avoid Multiple Type Order Creation. But this is quite complex. In one of my client, I have done this but their process was quite simpler.
See the below link.
Why do you create SAP Production Order or Process Order - SAPs'WORD - We SAP For Your Cause
Best regards
Shailesh