The WC single item template is located at:

yoursite.com/wp-content/plugins/woocommerce/templates/single-product.php

See this documentation:

https://docs.woocommerce.com/document/template-structure/

So, you would want to move any of those templates to your child theme under /wp-content/themes/your-child-theme/woocommerce/[any_template_you_want]

So, for example, if you wanted to edit the single-product.php but safe from WC updates, you would put the file in this directory and do your mods:

www.yoursite.com/wp-content/themes/your_child_theme/woocommerce/single-product.php

Last thing to mention here is keep the directory structure as well. So, if you want to edit something in the 'email' folder, it would be like this:

www.yoursite.com/wp-content/themes/your_child_theme/woocommerce/emails/admin-new-order.php (just for example sake)

So, copy any templates you want to modify using that documentation above and you will be safe from any updates over time.

The WC single item template is located at:

yoursite.com/wp-content/plugins/woocommerce/templates/single-product.php

See this documentation:

https://docs.woocommerce.com/document/template-structure/

So, you would want to move any of those templates to your child theme under /wp-content/themes/your-child-theme/woocommerce/[any_template_you_want]

So, for example, if you wanted to edit the single-product.php but safe from WC updates, you would put the file in this directory and do your mods:

www.yoursite.com/wp-content/themes/your_child_theme/woocommerce/single-product.php

Last thing to mention here is keep the directory structure as well. So, if you want to edit something in the 'emails' folder, it would be like this:

www.yoursite.com/wp-content/themes/your_child_theme/woocommerce/emails/admin-new-order.php (just for example sake)

So, copy any templates you want to modify using that documentation above and you will be safe from any updates over time.