Hi Prateek,
For your first requirement refer to this note.
323991
- Availability check:Subcontract PReq subcontract PO componnts
Second requirement, The excise entries when material will not come in 6 months or 180 days are
demonstrated with this configuration
SPRO-->Logistics - General-->Tax on Goods Movements-->India-->Account Determination-->Specify Excise Accounts per Excise Transaction
Regards
Binoy