Add a text field to woocommerce checkout, save the field data to user meta and order meta. Does not make the user meta show up in profile editor.

gistfile1.php

/**
 * Add the field to the checkout
 **/
add_action('woocommerce_after_order_notes', 'my_custom_checkout_field');
 
function my_custom_checkout_field( $checkout ) {
	
	echo '<div id="custom_checkout_fields"><h3>'.__('Member Listing Profile').'</h3>';
				
	/**
	 * Output the field.
	 *
	 **/
	woocommerce_form_field( 'organization', array( 
		'type' 			=> 'text', 
		'class' 		=> array('organization form-row-wide'), 
		'label' 		=> __('Organization'), 
		'placeholder' 	=> __('Organization Name'),
		), $checkout->get_value( 'organization' ));
	
	echo '</div>';
	
}
 
/**
 * Process the checkout
 **/
add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');
 
function my_custom_checkout_field_process() {
	global $woocommerce;
	
	// Check if set, if its not set add an error.
	if (!$_POST['organization']) 
		$woocommerce->add_error( __('Please enter your Organization Name.') );
}
 
/**
 * Update the user meta with field value
 **/
add_action('woocommerce_checkout_update_user_meta', 'my_custom_checkout_field_update_user_meta');
 
function my_custom_checkout_field_update_user_meta( $user_id ) {
	if ($user_id && $_POST['organization']) update_user_meta( $user_id, 'organization', esc_attr($_POST['organization']) );
	
	// check and make sure the stored value matches $_POST['organization']
	if ( get_user_meta($user_id,  'organization', true ) != esc_attr($_POST['organization']) ) wp_die(' We could not save your organization');
}
 
/**
 * Update the order meta with field value
 **/
add_action('woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta');
 
function my_custom_checkout_field_update_order_meta( $order_id ) {
	if ($_POST['organization']) update_post_meta( $order_id, 'Organization', esc_attr($_POST['organization']));