You can make the products as custom posts and create the taxonomies and terms appropriate for them.
EX:
Category - > subcategory - > post
Category - > product line - > product
The two running in parallel and without having to change anything at the time of registering the product, since it will respond to their own categories and terms.
To create the custom you need to put this in functions.php:
add_action('init', 'type_post_produto');
function type_post_produto() {
$labels = array(
'name' => _x('Produto', 'post type general name'),
'singular_name' => _x('Produto', 'post type singular name'),
'add_new' => _x('Adicionar Novo Produto', 'Novo Produto'),
'add_new_item' => __('Novo Produto'),
'edit_item' => __('Editar Produto'),
'new_item' => __('Novo Produto'),
'view_item' => __('Ver Produto'),
'search_items' => __('Procurar Produto'),
'not_found' => __('Nenhum registro encontrado'),
'not_found_in_trash' => __('Nenhum registro encontrado na lixeira'),
'parent_item_colon' => '',
'menu_name' => 'Produtos'
);
$args = array(
'labels' => $labels,
'public' => true,
'public_queryable' => true,
'show_ui' => true,
'query_var' => true,
'taxonomies' => array( 'Categoria' ),
'rewrite' => array('slug' => 'produto'),
'capability_type' => 'post',
'has_archive' => true,
'hierarchical' => false,
'menu_position' => null,
'supports' => array('title', 'editor', 'thumbnail', 'revisions'),
);
register_post_type( 'produtos' , $args );
flush_rewrite_rules();
}
With this you will only need to create product category hierarchies and create custom loops to retrieve the "products."
