functions.php

<?php 
// Register Custom Taxonomy
function register_product_origem() {
	
	$labels = array(
		'name'                       => 'Origens',
		'singular_name'              => 'Origem',
		'menu_name'                  => 'Origem',
	);
	$rewrite = array(
		'slug'                       => 'origem',
		'with_front'                 => true,
		'hierarchical'               => false,
	);
	$args = array(
		'labels'                     => $labels,
		'hierarchical'               => true,
		'public'                     => true,
		'show_ui'                    => true,
		'show_admin_column'          => true,
		'show_in_nav_menus'          => true,
		'show_tagcloud'              => true,
		'rewrite'                    => $rewrite,
	);
	register_taxonomy( 'product_origem', array( 'product' ), $args );
	
}
add_action( 'init', 'register_product_origem', 0 );

/**
* Register the 'Custom Column' column in the importer.
*
* @param array $options
* @return array $options
*/
function add_column_to_importer( $options ) {
	
	// column slug => column name
	$options['origem'] = 'Origem';
	
	return $options;
}
add_filter( 'woocommerce_csv_product_import_mapping_options', 'add_column_to_importer' );

/**
* Process the data read from the CSV file.
* This just saves the value in meta data, but you can do anything you want here with the data.
*
* @param WC_Product $object - Product being imported or updated.
* @param array $data - CSV data read for the product.
* @return WC_Product $object
*/
function process_import( $object, $data ) {
	if (is_a($object, 'WC_Product')) {
		if (!empty( $data['origem'] ) ) {
			$object->save();
			$product_id = $object->get_id();
			$tag = array(intval($data['origem']));
			
			wp_set_object_terms($product_id, $tag, 'product_origem');
		}
	}
	
	return $object;
}
add_filter( 'woocommerce_product_import_pre_insert_product_object', 'process_import', 10, 2 );