Hello Darryl,
Here are a couple of thoughts:
I have the top few levels of my outline structured something like this:
>Area of Life (Personal, Home/Family, Work and Community)
>> Role (Home DIY, Father, Friends, Electrical Engineer, Functional Safety Specialist... etc)
>>> Goal or Project
>>>>Sub-Project
>>>>>Tasks
That way, I can align my projects with my goals and my goals with my roles. Depending on whether I'm at work or it's home time, I can be looking in the overall branch for the relevant area of my life.
My Roles (the second level in my hierarchy) are all formatted as folders. This gives me an advantage for setting up filtered views. "TopLevelParent" filters will match with my Area of Life, while "TopLevelFolder" will try to match with my Roles.
Under a project, my first item is often a folder, for storing reference notes or a list of project contacts, job codes, etc.
All my projects and sub-projects are formatted as "Project".
Anyway, that's how I've got my outline set up. There may well be as many different set-ups as there are people in the forum.
Stéphane