I don't understand the Designer-Developer Workflow in the documentation...

[oodledev]

Maybe due to being english as second language or something but the explanation the I got is that the src may be used for all the business logic that application needs? For example we are meant to deploy for iOS/Windows/etc... how would the folder structure go?

What I'm confused as well in qt design studio is we can't seem to create modules and qt design studio doesn't recognize custom modules? I have tried editing the .qmlproject but it doesn't seem to detect anything?