How To Filter Products by Taxonomies in the Dashboard?

  WooCommerce provide Many Product filters on admin screen , such as “Select a category”, “Filter by product type”, “Filter by stock status”. For example ,if you want to add Custom filters like “Filter by tags” etc on products admin screen. “Product tag” is a default taxonomies of WooCommerce same as “Product categories”. We can use 'woocommerce_product_filters' filter for adding other texonomy filters too.   Paste this code to your theme's functions.php for adding filter to product admin screen.  

function CustomTaxonomyFilter( $data ) { 
  global $wp_query; 
  $data .= wc_product_dropdown_categories( array(
    'show_option_none' => 'Filter by Tags',
    'taxonomy' => 'product_tag',
    'name' => 'product_tag',
    'selected' => isset( $wp_query->query_vars['product_tag'] ) ? $wp_query->query_vars['product_tag'] : '',
  ) );
return $data;
}
add_filter('woocommerce_product_filters','CustomTaxonomyFilter' );

  Same filter can be used for extra custum texomony added.  

function CustomTaxonomyFilter( $data ) { 
  global $wp_query; 
  $data .= wc_product_dropdown_categories( array(
    'show_option_none' => 'Filter by Brands',
    'taxonomy' => 'product_brand',
    'name' => 'product_brand',
    'selected' => isset( $wp_query->query_vars['product_brand'] ) ? $wp_query->query_vars['product_brand'] : '',
  ) );
return $data;
}
add_filter('woocommerce_product_filters','CustomTaxonomyFilter' );