Can someone help me how to generate dynamic tabs with product categories in woocommerce. - product category as tab name, and their subcategories thumbnails as tab content
If you mean 'tabs' as in the way WooCommerce presents the Product Description, Attributes, and Review on the product page then take a look at the template files for WooCommerce. You can find them at ../wp-content/plugins/woocommerce/templates.
There's a good article on customizing the templates at http://wcdocs.woothemes.com/codex/template-structure/
You need to follow these guidelines to make sure that your changes are upgrade safe.