Subcontracting with excise duty ??

Hi experts

Can anybody explain me , how subcontracting procees haes been done with excsie duty ?

In short somebody can explain me here only , with any link.

I should know , how the excise invoice has being created and how capture and post the same will be happened ??

While sending the material for job work. the excise duty value 'll be less .

While receving as finished goods from subcontractor excise value will be more , so hopw this will happen in real time .....???????

Thanks

SAP-MM