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This feature is not yet stable. It is in preparation for the next release and will be available until end of June 2012. |
When you plan your project, especially in the beginning, you might only have a very high-level planning (e.g. time budgets on project or component level), and with the time, you can go more into details (tasks, sub-tasks). So you need to start planning with very rough numbers, but of course with the time, you want to benefit from being able to plan more in detail. It also might happen that some people in general prefer to plan top-down and others want to plan bottom-up:
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