Sellbrite does not have a built-in way to combine orders, but if you use ShipStation for shipping, you can merge multiple orders there into a single order.
How to combine orders in ShipStation
All you have to do is log into your ShipStation account and take the following steps:
Go to the Awaiting Shipments tab or the Stores tab.
Select the orders you want to combine.
Under the Other Actions menu, select Combine Orders.
How tracking syncs back to Sellbrite
When you combine orders in ShipStation, you can create a single shipping label for the combined order. However, tracking information will sync to Sellbrite differently based on how the orders are handled in ShipStation:
Orders that no longer appear in ShipStation: These get merged into the combined order, and their tracking information syncs to Sellbrite automatically.
Remaining order in ShipStation: This order will not receive tracking information automatically and will need to manually updated in either Sellbrite or the sale channel.