Hi,
Subcontracting process will be same material received before 180 days or after 180 days.
but excise credit you have to reverse that you posted during material purchase, if material not received within 180 days as per excise law 57AC.
PROCESS:
1. create a subcontracting purchase order(ME21N) with item category 'L' for material which you are sending to vendor. assign material as component which you are sending.
2. create a transfer posting for the material from MB1B or MIGO with movement type 541
3.subcontracting Challan on the basis of transfer posting, this is the document that you will send to vendor with material.
4. when material will return back as finish good , receive material with respect to that subcontracting PO.