Multiple table entries Creation in single object page Without Navigation to another page

[User_1443410]

Hi Community ,

We got a requirement in RAP(ABAP Environment ) which contains header data, multiple purchase order creation table and attachment table.

In Purchase order table , we need to create multiple PO in same screen itself without navigating to next screen/page (screenshots are added ) .We have trying to developing this screen using Managed Scenario. Pls guide us . 

ABAP RESTful Application Programming Model   SAP S/4HANA Cloud, extended edition 

@peterpersiel