Hi bonnieW,
I did not see similar solution before, so I tested in my localhost, the variable Woocommerce products is using a hidden post type "product_variation",
which is a child post type of post type "product", and can not be create/edit by CRED
you can view all variable products by run the sql in your database with mysql tools, such as phpmyadmin:
SELECT * FROM `wp_posts` WHERE `post_type` LIKE 'product_variation'