Hello
How would I start a new business under an LLC that is already established?

Hi, Durham Family!

Greetings and WELCOME to the site! I just moved your question that you had posted in Introductions to this forum topic area so that it will get the most exposure to those who are best able to answer it. Introductions is for people to introduce themselves and we try to not ask questions there.

It can be a little confusing when first learning how to use this site! Your question will get noticed much more in this forum topic area.

We would appreciate it if you would return to Introductions sometime to tell us a little about yourself though, if you would be willing to do that.

Thanks!

You could perhaps set up a DBA (doing business as)

DBA is the way to go. Some states will let you rename the LLC, but it isn't worth the trouble. DBA let's you open multiple enterprises under one LLC. Good luck!