Eway bill clarity required

Trader had made bill on 10th March 2018 and generated eway bill for the same. The customers factory is in the same state 100kms away from trader. The customer kept the material in his gowdown near to traders premise and was not able to despatch the same in 24hrs. After two days they asked for a new eway bill to transport material from his godown to factory. Please guide on how to handle the situation by the trader.. Whether to cancel old bill and generate new bill and new eway bill along with