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.

Sajedeh Gooklani

Mahdi Yazdani

MyPreview

This plugin designed with extensibility in mind for data that should be associated with a particular block type but need not have any defined meaning. <code>data-*</code> attributes will allow you to store extra information on different Gutenberg blocks, without other hacks such as non-standard attributes, appending properties on DOM, or modifying a block as HTML which will throw a block validation error when opening the post edit page once again.

Block Data Attribute

Saved me from having to build it myself. Surprised this still isn't built into native block functionality. Thank you!

Time saver

This plugin designed with extensibility in mind for data that should be associated with a particular block type but need not have any defined meaning.

Vitt Attribute Hierarchy for WooCommerce vs Block Data Attribute