Create Multi Level Bullets in Campaigns

Hello- Is there a way to have sub-bulleted lists without having to restart a list?

i.e. I would like to use a numbers list but then have sub-bullets that are either little letters (a, b, c, etc) or plain bullets and then be able to go back to the main list. Right now the list starts over when I add a sub-bullet. 

Also the ability to have line breaks between a numbered list would be ideal as evidenced below. This doesn't work in the email template.

1.  example
   • dtlk
2. djlaksd 
   
   
3.