Hi keithyung2014,

The site you captured screenshots are using Quantity manager plugins, which enabling you to set fixed quantities with price. And WoodMart does not have this option, unfortunately.

I found they are using one of these plugins:

https://woocommerce.com/it/products/advanced-product-quantity/
https://barn2.com/wordpress-plugins/woocommerce-quantity-manager/

Please note that we do not give a guarantee for full theme compatibility with all existing 3rd party plugins. Sometimes, not always, you need additionally customize the theme or plugin to make them work together. Unfortunately, it’s not possible for the author to make the theme compatible with all the existing plugins and additional customization is outside the scope of our basic support.

Regards,