Extend Standard App - Track Sales Order Details

[janithi]

Hi,

I'm doing customization to the Sales Order Process Flow which is in the standard Track Sales Order Details app.

And I'm going to add a static link to the "More Link List" which opens when clicking on a specific process flow item.

I've checked the Track Sales Order Details app source and found that the content of the app is loading by reusing components from another app called Sales Order Fulfillment.

The problem is in the documentation it shows this app is replaced.
Sales Order Fulfillment Documentation

And in the extensibility list, it shows UI hooks for the process flow

Sales Order Process FlowProcessFlow_Model.js

Extensibility List

But I'm unable to find this application to view the source in my ABAP repository as this application has been replaced.

Will it be possible to do the extension ?