You need to close and re-open POS to refresh. Most people don’t add categories often. I have just added a manual “Reload Categories” button, so you can refresh without restarting POS. Please get the upgrade. The department name in WooPOS won’t be uploaded to WooCommerce. You have to create the categories in WooCommerce and select them in product editing screen either in WooPOS or in WooCommerce.