Help Outlining Format

So I just downloaded LibreOffice to use for taking notes in class. I always outline while taking notes. I figured out how to outline so that each new subcategory has a new symbol/number in front of it. So when I press enter, the next number header in the sequence appears. Then when I press tab, the next subcategory appears. What settings do I need to change to make enter go back the the previous heading?

For example:

I.Main heading
A. Sub-heading
II. Main heading

Does SHIFT+TAB (after ENTER) give the desired result?