Ember dynamic segments and folder structure

I am trying to implement the following route structure in my Ember app;

this.route('mainStep', function() {
  this.route('subDynamicStep', { path: '/:sub_dynamic_id' }, function(){
        this.route('commonChildStep1');     
        this.route('commonChildStep2');
  });
});

So I can have the following possibilities;

mainStep\subStep1\commonChildStep1
mainStep\subStep1\commonChildStep2
mainStep\subStep2\commonChildStep1
mainStep\subStep2\commonChildStep2

Now my question is, if I want to have the above kind of implementation, would I have to create separate physical folders even for the dynamic segments (i.e. subStep1, subStep2) under the parent 'mainStep' routes\controllers\templates

is there any better way, coz otherwise I can reuse commonChildStep1, commonChildStep2 for each of the "subDynamicStep"

Basically, I wanted to know if I can leverage the commonChildStep1,commonChildStep2 for each of the posible dynamic segments (for subDynamicStep)