thevittfile

The plugin looks up the sub-attributes in your product, then for each value it looks up its parent and adds the parent attribute and the parent value in the product. 
When using a filter with the main attribute on the store page, all the products that have that main attribute are returned, which are the same products that contain the associated sub-attributes.
Important: 
You can’t create multiple hierarchy levels, just one. 
Two diferent attributes cannot contain the same sub-attribute.
<h3>Documentation</h3>
<a href="https://github.com/vittfiles/vitt-attribute-hierarchy" rel="nofollow ugc">vitt attribute hierarcht for woocommerce</a>

Vitt Attribute Hierarchy for WooCommerce

This plugin works simulating a hierarchy for attributes and subattributes.

Inbound Horizons

Cliff

Bulk Sort Attributes for WooCommerce is a WooCommerce extension that allows you to bulk 
order WooCommerce attributes by ID, Name, or Name (Numeric). When there are 
hundreds or even dozens of items in an attribute it becomes tedious and time 
consuming to sort by hand. This plugin makes it an easy task!

Bulk Sort Attributes for WooCommerce

Bulk sort WooCommerce attributes when they are too numerous for custom sorting by hand.

Vitt Attribute Hierarchy for WooCommerce vs Bulk Sort Attributes for WooCommerce