if you are dealer then you need not to pay excise duty.
i think you just need to pass the duty to your buyer as the person from whom you have purchased the material has already deposited duty.
you can pass the duty by issuing excise invoice under Rule 11.
you need not to charge or deposit duty ,you just need to show the amount of duty on invoice issued by you on proportionate basis.so that the buyer can claim the cenvat credit.
further as per Rule 9 of CCR 2004 you have to file Form no.2 with department on a quarterly basis.& due date for each quarter is 15th of the following month after the end of quarter to which it relates.and in this you have to give details of duty pass on & the basis.
say for quarter ending 30th june due date is 15th july.
i am giving suggestion as per my knowledge if sumthing is wrong there so plz let me learn too.and wait for other to reply.
Thanks