For the purpose of sub-contracing into DTA unit, an EOU seek annual sub-contracting permission from the customs authorities as per para 6.14 of FTP 2009-14. Procedure is as follows :
1.Consent and undertaking by DTA unit on their letter head.
2.Submit application to customs authorities along with consent and undertaking for obtaining annual sub-contracting permission.
3.After obtaining permission, forward a copy of subject permission to DTA unit.
4.Prepare job work challan in form of A B Challan
5.Entry in stock ledger (Job work register for sending goods for job work)
6.After processing DTA unit will prepare the CDE challan along with their bill for job work charges.
7.Account for the processed goods into your unit and also mark the entry in job work register.
as per my view the following is the procedure.