Attribute Optimizer
If all subcategories under a parent category contain the same Attribute, the Attribute Optimizer tool will unify them into a single Attribute on the parent category. Attributes on a parent category naturally flow to the subcategories beneath them. This will optimize your attributes so that they only need to be managed from a single category.
Clicking "Start" will begin the optimization process. Once started, you will see a progress bar along with a Time Left counter to indicate how much time is needed to complete the process.
Make sure to review any changes before confirming the Attribute Optimization process. Once the changes have been made, they cannot be undone once it has been completed.