Zoho Mail, Composing bullet points.

Zoho Mail, Composing bullet points.

Here is something I find I am missing when I create a letter. When I Bullet Point a section, it can only be numbers. Is there a way to have numbers... and when it is indented, or a child paragraph, it contains a letter? 

So now I can only get it to do this:

  1. Parent
    1. Child.....
I would like the number letter combination. 

  1. Parent
            a. Child 

I have a feeling it is only numbers.