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Can I add more than tab, or change the order of the tabs?

This free version does not have that functionality, but now you can with the paid WooCommerce Tab Manager

Can I share tab content between more than one tab?

This free version does not have that functionality, but now you can with the paid WooCommerce Tab Manager

I already use the free plugin and now I want to upgrade to the premium Tab Manager, is that possible?

Yes, the upgrade process form the free to the premium Tab Manager plugin is painless and easy.

How do I hide the tab heading?

The tab heading is shown before the tab content and is the same string as the tab title. An easy way to hide this is to add the following to the bottom of your theme's functions.php:

add_filter( 'woocommerce_custom_product_tabs_lite_heading', 'hide_custom_product_tabs_lite_tab_heading' );
function hide_custom_product_tabs_lite_tab_heading( $heading ) { return ''; }