Hi Rahul
To Carry out product costing you need to have the BOM and Routing on SAP Side.So you need to build at least the BOM and routing inbound interface in SAP.
There is no standard inbound interface available for this.Though we have standard outbound interface for BOM and routing.
Message type for BOM - LOIBOM ,routing-LOIROU,Work centre-LOIWCS.
Normally SAP is the leading system interms of master data when we deal with interface but in your case it is different.
You can refer LOIBOM,LOIROU etc for building your segment and try to build the interface.
Let me know if you have any questions.
Good Luck!!!!!!!!!
Thanks,
Jagmohan
