Add custom checkout field to the order details in admin

Hi,

I am using a plugin to add custom checkout fields to woocommerce check out page called “WooCommerce Checkout field editor”

I added a required field to the checkout called “Employment/Assignment Number” with the field name “Employment_Assignment_Number”

The field is working nicely but it is not saving the data from the custom field to the order details under wordpress admin – orders

What function i should add to get the field to save the data from the custom field for each order under each order info in order details under wp admin.

Thanks for your help

https://wordpress.org/plugins/woocommerce/