E way bill sub type

Actual sale quantity is known only when vehicle reaches concerned customer, Sales invoice is raised at the premises of customer. Is it in any way related to Line sales or Recipient not known under E-Way Bill.? 
Taking goods from main business permisses to some where out of home town. And showing good to clients (number of) they will take what they want. So can come to know how much value sold to a client and who is client only after movement of goods. (The destination also unknown). This is they call as line sales.

sir, please provide book/section/rule reference under which the same can be obtained.

please also confirm the meaning of sub type recipient not known?

Recipient Not Known – If we study the e-way rules, especially pertaining to unregistered dealers, we will understand that the recipient may be deemed as known or unknown, based on the knowledge available to the supplier at the time of commencement of movement of goods. In certain business models, unregistered suppliers manufacture goods at their place, and then bring the goods for sale to a common market, where lot of buyers are available. In such a situation, the unregistered supplier will obviously not know at the time of movement of goods, who he is ultimately going to sell the goods to. In such a situation, the e-way bill is not mandatory. However, the unregistered supplier will still have an option to generate the e-way bill. Thus, in case the unregistered dealer chooses to generate an e-way bill under such a scenario, the option “Recipient Not Known” in e-way bill generation screen, will be chosen.