Is it possible to have projects (sub-projects) within projects?

Or would it be better to set up several different files, each containing projects within a different major category?


Yes that’s certainly possible. Again use tab indentation to indent on project under another project… to create a subproject.

It’s up to you if you want to create subprojects, or use multiple documents. I think generally people will use one document with many projects… until that gets to much and then they split things up.