Currently the WooCommerce Product Importer does not support importing of product Slugs (also known as permalinks). This plugin adds this functionality.
This plugin is written as a companion to the blog post titled: Importing Custom Permalinks / Slugs in WooCommerce
Download "woo-slug-importer.zip" here, or zip up the file "woo-slug-importer.php".
Install it using the Plugins screen in WordPress.
When creating a CSV products file, please make sure that your CSV file contains a "Slug" column.
Created by Phil Oxrud. Find me on twitter as: @poxrud