Ah, I think I see now, let's see if I have this correct:

1. Click on "Create New Style"
2. Copy whichever stylesheet you want to start from (if any)
3. Click on "Name, Images & Wrapper", the first option on the left.
4. Rename the "Style Name" in the first box from the one you copied to the one you want to name (for example - UBBThreads to Test1)
5. After you've done the changes you want and click "Update or Add Style" and it will save the name you entered from step 4 (in this case, Test1).

Do I have that right?

Thanks muchly,