Hello,

For the additional tab you can use “Additional tab title” and “Additional tab content” options from Theme Settings >> Product Page >> TABS:

Screenshot for clarification: https://jmp.sh/EM0NPNB

For adding slider you can use the WoodMart slider or revolution slider using Wp-Bakery page builder inside the description tab or in the additional tab.

You can configure upsells products to show on some particular products. Read more information in the WooCommerce documentation https://docs.woocommerce.com/document/related-products-up-sells-and-cross-sells/

Best Regards.