When adding a product to a Live batch, if your item is assigned to a new fulfillment center, a pop-up will appear to show the new shipments being created:
The pop-up will display the fulfillment center, label prep type (SELLER_LABEL, NO_LABEL, or AMAZON_LABEL), and qty of units routed to the destination(s).
Note: The shipment destinations are determined by Amazon and they do not allow you to only create portions of your shipping plans. For more information, please refer to their help article on this topic.
If you have assignments that are both for new and existing Working shipments, the pop-up will show you the Working shipments that your items are going to be automatically added to with a green "Working" tag next to the fulfillment center. (This cannot be edited and is for informational purposes only.)
To proceed with adding the MSKU to the batch with the destination(s) shown, click Accept.
In the event that you have no new fulfillment center assignments, your items will automatically be added to your existing Working Shipments available of the same prep type and fulfillment center.
No popup will occur in this case. This is why it is crucial that any shipments you have completed already are Marked as Shipped in Seller Central and not appearing in your Working Shipments section of Stratify prior to adding items to Live batches.