Dynamically add a new field to a form in Ember?

I am trying to dynamically add a dropdown to a form using Ember. I am new to Ember and don't know where to start with this. I am thinking I need a way to render a select box after the page has already been rendered while also incorporating the new element into the model.

The flow would be something like: 1. click button, 2. a select is created, 3. select an option, 4. repeat 1 thru 3 adding as many options as necessary, 5. submit form.

Here is a graphic of the selector generator

I can't find any documentation to help with this. Is there anyone that can help?