GTD has support for that with its "Project Support" documents, higher-level reviews, multiple Next Actions for same project, etc. I feel it does cover the situation, and you can still do it just when you run out of obvious things to do or stop for the day.
The "Next Action" is really just to ensure you know what actually can be done and when and not just have the project (e.g. "Buy car") as the action.
The "Next Action" is really just to ensure you know what actually can be done and when and not just have the project (e.g. "Buy car") as the action.