When sending a re-order through the data bridge, the process is nearly identical to sending a new order via the data bridge (article found here).
You must keep one thing in mind when it comes to re-orders. Similarly to internal re-orders, data bridge re-orders also must begin with a "re-order" of the order in question. Here's how to do it.
Find the order you wish to a) reorder, and b) send to an affiliate shop
Click "Re-order" on the order page
You will be redirected to a re-order of your original order
Then, follow the process for sending an affiliate order (article found here)
Once the order has been accepted on the receiving end, the receiving shop will retain all previously added detail to the original file (such as raw artwork, documentation, etc)
If you have any questions, please reach out to support@stokkup.com.