How to create modules with sub regions in view of module in Prism?

Question

I am new to Prism, sorry if this is dumbest question but here is the situation.

I am workin on currently a CRUD application, typically an accounting system.

Now I have a parent Shell with following modules.

Application Shell
-> OrdersModule
-> ItemsModule

Now I have got tabs for both modules, and in my orders module, I want to create master detail views as seperate regions, however in my Items Module this may not be the case.

And I want OrdersModule's master detail view to discover the list and detail modules/views and add them.

I saw the Stock Trade example on Prism Source, but I am unable to understand how to nest the views and regions.