Pulling the top level assebmyl name as parameter in subassembly drawing

Lower level parts in an assembly have no "knowledge" of what assembly they are a part of. This makes sense, since  a given part (or assembly) could be currently used in many assemblies. No informative link between a lower level component and the assembly it's used in is made.

If I want a given part or assembly to know the "top level assembly", I use relations in that assembly to set a parameter in the component so it "knows" the part number or whatever identifier I'm using. If there's a more complex hierarchical structure involved, I have to pass the parameter down through each level of assembly to reach the lower components.

If you use Windchill, it may be possible as there is a where used report capability in Windchill.

Would take some programming to get the information into Creo.

Manually crated parameter may be the way to go but this has serious drawbacks when you add that component to another assembly and have to keep adding new parameters for each assembly it is used in.