If I were doing it.
1. I would place the title at the top of the page. then double space to the outline.
2. Type the Roman number I at the left margin, then tab once to type in the text.
3. Press enter. You will now automatically have Roman number II. If you want that, tab to add text. If not, tab once without typing anything and the Roman II will magically become an A. Tab once from the A to fill in the text and press enter.
4. Now you have B. If you want it, type the text and press enter and you will have C.
5. If you don't want C, shift+tab and C will magically become Roman II.
6. If you want little Roman i, ii, and so on under C, tab once and they will appear. Shift+tab to go farther to the left.