Eway bill and invoice

XYZ Ltd. (Maharashtra) will be supplying the goods to Nepal by following this procedure:1) Mumbai – Patna by Blue Dart 2) From Patna Blue Dart Hub, Material will be transported by Bus to Raxol Border. 3)At Raxol Border – XYZ will get the customs stamp on invoice. 4)The material will be collected at the Nepal Border by the Consignee. Kindly guide how to raise e – way bill and tax invoice by XYZ in this situation