Best practice for RH lists like these is to pretty much
follow a similar process as in Word: number the entire outer list,
and then work your way into the inner levels. The real difference
is that you don't have Word's multiple options presented to you as
templates. Instead, you need to step through part of the process.
1. Create
all the paragraphs that will constitute the list as Normal
text (or remove all numbering from an existing list).
2. Select
all paragraphs and click the Create a Numbered List toolbar
button.
3. For sub-numbers, select "sublist" paragraphs and click the
Increase Indent toolbar button. (You can then change the "sub"
formats [a,b,c, i,ii,iii, etc.] through the Style menu.)
4. For sub-bullets, perform step 3 and then, with the
"sublist" paragraphs still selected, click the Create a Bulleted
List toolbar button.
This seems to be the only way to fool RH into
not ending the numbered list when it sees a sublist, then
starting a new list when resuming the outer list.
The bothersome part is when you have to modify the list,
because RH will try to "help" you by adding closing and opening
tags as you add or delete content. Your choices are to either clean
up the underlying code, or remove all numbering, make your changes,
and perform steps 2-4 again.
Good luck,
Leon