The way I solved a similar problem may not be the best in coding practices but it works. It takes custom data associated with the order from Gravity Forms and displays it under the shipping address in WooCommerce individual order page:
<?php
add_action('woocommerce_admin_order_data_after_shipping_address', 'ips_show_signs_in_admin_under_shipping', 10, 1);
/*
function to put in functions.php of the theme to add custom gravityforms data to customer order page in admin area.
*/
function ips_show_signs_in_admin_under_shipping($order)
{
global $woocommerce, $post;
$order_items = $order->get_items(apply_filters('woocommerce_admin_order_item_types', array( 'line_item')));
foreach($order_items as $item_id => $item)
{
if ($metadata = $order->has_meta($item_id)) //not a comparison, so one equal sign. so if there is any data in there it would assign it and thus making it true, if no data it would be false
{
foreach($metadata as $meta)
{
// Skip hidden woocommerce core fields just in case
if (in_array($meta['meta_key'], apply_filters('woocommerce_hidden_order_itemmeta', array(
'_qty',
'_tax_class',
'_product_id',
'_variation_id',
'_line_subtotal',
'_line_subtotal_tax',
'_line_total',
'_line_tax',
)))) continue;
if (is_serialized($meta['meta_value'])) continue; // Skip serialised meta since we dont need it incase its in there
$meta['meta_key'] = esc_attr($meta['meta_key']); //just to make sure there is no surprises in there
$meta['meta_value'] = esc_textarea($meta['meta_value']); // using a textarea check for surprises (sql injection)
if ("Signpost Address" === $meta['meta_key']) //here comes the custom data from gravity forms
{
echo $meta['meta_value']; //this is what i was after from gravity forms collected with order
}
} //closes --- foreach($metadata as $meta)
} //closes --- if ($metadata = $order->has_meta($item_id))
} //closes --- foreach($order_items as $item_id => $item)
} //closes --- function
?>
Edit: This code searches the order meta data