Justok...

Orders (Order_ID, ....)
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/|\
OrdItems (Order_ID, ITEM, QTY, ....)
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/|\
Shipment (SHIP_NO, Order_ID, ITEM, SHIPQTY, ....)

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Maybe better would be:

OrdItems(OrdIt_ID, Order_ID, ITEM, QTY)

Shipment(SHIP_NO, OrdIt_ID ...) to tie the shipment(s) to the OrdItems table instead of to Orders. Then each line item has one or more shipments easily tracked.