Sometimes a Shopify order needs to change after your customer has placed it, for example a partial cancellation or refund or change to the quantity of an item.
If the order has been imported into ShipStation, you can sync the new information to ensure you see the updates before you process the order. Click the Import button 
in ShipStation to pull this new data from Shopify.
ShipStation will compare the fulfillable quantity of each order's line items and do the following when the new data differs from the existing order record:
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Modify the quantity of the item(s) in ShipStation to match Shopify.
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Adjust the product total for the order in ShipStation.
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Show an alert in the Order Details that a change has been made to the number of items in the order.
Please be aware of this feature's current limitations:
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Will not adjust the weight of the order to reflect the change in item quantity.
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Will not remove line items that change to a quantity of 0 (but ShipStation will display 0 for the item in the Qty field).
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Will not adjust the quantity for customs declarations. If this is an international shipment, you must manually adjust the quantity in your customs declarations.
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Will not adjust the total paid (only the product total).
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Will not adjust the item quantity if orders have been split into multiple shipments in ShipStation.