E way bill

In this case it comes under Line Sales  – Line sales in GST basically imply vertical sales which are made from one unit / department / division of an organisation to another unit / department / division, which is next in the production line. This basically holds true for goods which are output for one process being transported as input for the subsequent process. Line sales in GST is thus an important transaction sub-type to be considered, as “line sales” in e-way bill generation screen will need to be selected

It's Line Sale :
when goods are transported to customer, but actual sale quantity is known only when vehicle reaches concerned customer, Sales invoice is raised at the premises of customer

You have generate the e-way bill on Delivery Challan by selecting sub type Line Sale , & can carry your goods , but bill for same is to be raise on customer place as soon the goods being sold