The WooCommerce Customized Category plugin makes it possible to add two more displaytypes to the category displaytype dropdown. 1. Subcategories (indexed), which shows the subcategories only, as an indexed list ordered alphabetically. 2. Both (subcategories indexed), which shows the subcategories as an indexed list ordered alphabetically, followed by the products. Go edit a category or greate a new one, and select either Subcategories (indexed) or Both (subcategories indexed) from the displaytypes dropdown list. View the plugin in action here at this shop, check it out.