WooCommerce Checkout Manager allows you to export the custom fields created in the billing, shipping, and advanced section.

WooCommerce doesn’t offer native support for the orders and customer fields, so you need to install the official plugin WooCommerce Customer / Order / Coupon Export.

Checkout Manager for WooCommerce is compatible with this plugin and lets you include the custom fields in the exports generated by WooCommerce Customer / Order.

To export your customer and order fields, you have to activate the Export custom fields option in the advanced tab and follow the steps described here.