NW GW Model versioning- use case

Hi All,

I am just exploring the  use of GW Technical model versioning, like can we reuse any existing technical model.

It would be grateful any one can explain the use and the best use case for the Model versioning.

I tried using the existing Model into a different GW Project while the runtime objects generating, and the service builder created the XXX_DPX_EXT with the different version and nothing in it.

I don't what does it  intended to do, and how to use it.

Thanks

Rajesh