If you want to pass the excise duties to customer then only you will have to have the BED or AED in sales order and you have to configure the CIN related settings other wise No need . This you have to check with your business team.
Normally your case it is not required any CIN settings as per my knowledge again as i said this has to be decided by business, after importing material the sales price includes all the cost incurred of all import duties.and we sell this materials as normal OTC with out any excise condition values in the document.
thanks,
Srinu.