how create top down assembly in pro-e 5.0?
1. Create a new assembly
2. In this assembly, create a skeleton: a sketch with basic dimensions of your assembly.
3. Publish geometry: create groups of the parts of the sketch that belong together.
4. Create parts and import the publish geometry for each part that is relevant for that part
5. Model your parts using the publish geometry as reference!
The top down means, that you have the big picture laid out in the form of a sketch,all parts make use of that same basic sketch and can be further modelled by different people with little risk that they wont fit together.
By modifying your skeleton model, all relevant parts will be modified automatically (but if you remove parts of the skeleton sketch, you will enter a world of pain..).