Part-A Slip is a temporary number generated after entering all the details in PART-A. This can be shared or used by transporter or yourself later to enter the PART-B and generate the E-way Bill. This will be useful, when you have prepared invoice relating to your business transaction, but don’t have the transportation details. Thus you can enter invoice details in Part A of eway bill and keep it ready for entering details of mode of transportation in Part B of eway bill.