Applying a Usage assigns that Usage’s property values automatically.
If a geometry feature has a Usage, the section will inherit properties and values from the Usage it references.
If the property value is over-ridden in the feature, the feature-level property has priority. That is, feature properties override the Usage’s properties at the instance level.
Usage Level
Controls multiple features.
Edit in the Usages Editor
Use to control many objects
Feature Level
Controls a single selected feature
Edit in Properties Palette
Use to override Usages in a one-off fashion