How to setup Attachments , so as have it passed from Order Management to Purchasing

Performing the below steps:

1) CTO Model is entered on the line in Sales Order form

2) Configuration finished

3) Customized code is written to have runtime attachments created in Order Management for line

4) Order is booked

5) Sourcing and  ASL setup  is performed to have a PO generated based on the configuration

6) Order is progressed

7) Star Item is released

8) Requisition created

9) PO is generated

10) Star Item appearing on the PO lines with NO attachments

Problem: we would like to pass the Sales order line attachments for the CTO Item to the PO lines before the PO is approved, so that we can print the information on the PO.