I won't begin to pretend like I fully understand the intricacies of multi-level lists and their relationship to styles. I am an intelligent person, yet I find working with styles incredibly confusing. Having said that, this is what I'm trying to do...

I want a multilevel list numbered like this:
I.
A.
1.
a.
..etc. I know how to do this with Define new multilevel list. Each level will have a heading in a specific font.

The problem is, I want to include body text at each level of the list, but I want the body text to have a normal, not bold font that aligns with the heading. If I just hit return after the heading, it auto-numbers to a new heading, but I want to type text under the heading. So I can backspace to end the auto-number and type the body text, but when I want to write the next heading, I have to turn the list back "on". This is extremely tedious and I feel like there must be an easier way to do this. So, if I wasn't clear, I want to do this:

I. Heading 1
body text under this heading aligned with heading
A. Heading 1.1
body text aligned with this heading
II. Heading 2
Body text etc etc.

Any suggestions to make this easier? Thanks!