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The top-down design process is still a collection of individual parts that simply reference a higher level assembly for its definition. As long as that associativity exists, you can change to your heart's content, and if you set up the original models well enough, it will follow changes throughout the design as you tweak it. In the background, Creo will load all the data it needs to define each part as long as it can find it.
This also means that you can create drawings of any individual part or subassembly as it is defined in the associative assembly. You kind of have to look at the philosophy to understand there really are no limits, but plenty of pitfalls if you don't plan your project to some extent.
You have some things to learn but you can make "annotations" of measurements. You can also create "relations" to manage your "materials". In the top level, or any sub-level assembly, you can access these relations to build bill of material data or other custom tables on the fly.
Creo doesn't spoon feed anyone. -You- decide what you want and how you want to present it. Of course, this means, -you- have to make it do what you want.
