Note:You have to have the Custom Property filled in Descripition under each part for this to work. Also, a description property can be added when doing a save on the part file, instead of going to the Custom Properties each time.
1) RMB click the assembly icon
2) choose "Tree Display"
3) "show components description" from the context sensitive menu.
This will show the parts description, from custom properties, next to the part number on the feature tree. Now its easy to find your 'top housing', 'frame', or whatever in the tree.
