Debit/Credit Note Entry

sir,

is there any amendment in gst law regarding making of debit note or credit note which were required to be made per earlier bill wise.

now can one make one debit note of earlier 100 of supplies of same item, same customer (summed qty multiplied with rate amendment ) in a consolidated fashion, as it used to be in excise days.

how to upload such single debit note with many (100s) references of old supplies