woocommerce/docs/extension-development/using-custom-attributes-in-menus.md

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post_title: Using custom attributes in menus and taxonomy archives

Attributes that can be used for the layered nav are a custom taxonomy, which means you can display them in menus, or display products by attributes. This requires some work on your part, and archives must be enabled.

Note: This is a Developer level doc. If you are unfamiliar with code/templates and resolving potential conflicts, select a WooExpert or Developer for assistance. We are unable to provide support for customizations under our Support Policy.

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post_title: Register the taxonomy for menus

When registering taxonomies for your custom attributes, WooCommerce calls the following hook:

$show_in_nav_menus = apply_filters('woocommerce_attribute_show_in_nav_menus', false, $name);

So, for example, if your attribute slug was size you would do the following to register it for menus:

add_filter('woocommerce_attribute_show_in_nav_menus', 'wc_reg_for_menus', 1, 2);

function wc_reg_for_menus( $register, $name = '' ) {
if ( $name == 'pa_size' ) $register = true;
return $register;
}

Custom attribute slugs are prefixed with pa_, so an attribute called size would be pa_size

Now use your attribute in Appearance > Menus. You will notice, however, that it has default blog styling when you click on a link to your taxonomy term.

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post_title: Create a template

You need to theme your attribute to make it display products as you want. To do this:

1. Copy woocommerce/templates/taxonomy-product_cat.php into your theme folder
2. Rename the template to reflect your attribute – in our example we’d use taxonomy-pa_size.php

You should now see this template when viewing taxonomy terms for your custom attribute.