Hello,

Please move your custom to functions.php of the child theme to keep for every update.

Please consider using the Woocommerce builder of WoodMart allowing to create custom templates for product pages and other functional pages that are not editable by default. Woocommerce builder is the inbuilt functionality widget included in the builder you use on the site.

Please check this manual: https://xtemos.com/docs-cat/woocommerce-layouts-builder/?theme=woodmart

If you have any questions please feel free to contact us.

Best Regards