Please advice me

As we are a manufacture for coaltar and we purchase our rawmaterial ex-tariff 2706100 crude coal tar,waste coal tar and we sale coal tar pitch,creosote oil, now my question is that if we make some other product and the rawmaterial for that product is crude benzol ex-tariff 27071000 , cashew nut shell liquid (CNSL) ex-tariff 13021920. now we want to sale this final product in the name of PROCESS OIL so pls advice shall we use this name if yes then which excise tariff we shall use. Thanks & Regards