Editing CK EDITOR list plugin

I am using CK editor and I need to customize the list function. currently when you click on the list button it will display a a number and you can enter your information. When you hit enter it will then go to the next number. Basically it works like this right now.

<ol>
<li>test</li>
<li>test</li>
<li>test</li>
</ol>

I need it to be more dynamic. I need to be able to create a list like:

<ol>
<li>test
<ol>
<li>Sub1</li>
<li>Sub2 <ol>
<li>Sub-Sub1</li>
<li>Sub-Sub2</li>
<li>Sub-Sub3</li></ol>
</li>
</li>
<li>test</li>
<li>test</li>
</ol>

I have attached the code beacuse I have no idea how to get this done..thanks
plugin.js