Hello,
Thank you for using our theme, the website looks awesome 🙂
Currently the only one place you can use Visual Composer for your products it is “Description” field in admin panel (if you don’t see VC interface there you can turn it on in Visual Composer -> Role manager -> Post types).
If you want to place your Visual Composer based content to the top on the product page you may need to perform additional customization. Edit (or override in the child theme) a file basel/woocommerce/content-single-product.php
and place this code whenever you want to see the description
<?php the_content(); ?>
Hope this will help you.
Regards