StarShip supports consolidating multiple Shipments into one shipment in StarShip. This means you can ship a group of Acumatica Shipments with the same Ship To address at once.
Simply select the Shipments and click Create Shipment.
On the Ship screen, you can see under Source that both Shipments are on the StarShip shipment.
You would then continue processing the shipment as you normally would.
Once the master shipment is processed, StarShip writes the shipment information for each Shipment back to each individual shipment, to the Record Note on the Shipment. Notes for the complete shipment write back to all of the shipments, however the package contents will be that of the current shipment.