By default WooCommerce adds 3 tabs/blocks:
- Description – which is the product description;
- Additional informations (renamed in Rey as Specifications) – automatically filled with product attributes;
- Reviews – product reviews.
Rey adds a custom tab/block called “Custom Information“, which can contain any content, and can be edited globally (in Customizer eg: https://d.pr/i/mQ8ZlF ) or individually per product (in product backend, Info Block tab eg: https://d.pr/i/RTs3Iz ).
For all of these tabs/blocks, please access Customizer > WooCommerce > Product page – Tabs/Blocks and you can find various options to customize, change order, or rename.
Please access Customizer > WooCommerce > Product page – Tabs/Blocks and scroll at the bottom where you can see the Custom tabs control that lets you add as many as you want eg: https://d.pr/i/17QlJU . You can add a default title and a priority order value.
To actually add content in this tab, navigate to a product page in the backend and open the Custom Tabs tab eg: https://d.pr/i/KgVUDV . You can change its title and its content.
Simply access Customizer > WooCommerce > Product Page – Tabs/Blocks and scroll at the very bottom where you can choose which tab/block to move into the Product summary accordions block.
Quick video screencast here https://d.pr/v/Dq6SMz .