Ability to group/sort projects, create sub-projects

I’ve been managing the high-level picture in MLO. It never gets “done”, and I don’t expect it to, but I have high-level folders such as (with some examples drilled down into),

  • Intellectual improvements
    • Read books
      • Fiction
      • Non-fiction
    • Learn skills
  • Physical improvements
    • Body recomposition
      • [x] Cut to under 15% body fat
      • [ ] Bulk
        • [x] Buy Jeff Nippard’s program
          • [ ] Follow it for 9 weeks
    • Flexibility
      • Read the MIT stretching book
        • Select stretching program
    • Cardio
  • Move
  • Career
  • Relationships

Not claiming this is GTD; rather, I find the hierarchical view useful for higher-level organization.