While adding a channel I get an option to select a Default Warehouse, what does that mean?

You need to select a default warehouse for every channel you integrate with Cin7 Orderhive. 

Ideally, the warehouse is the location where you stock your products and fulfill orders from. 

While adding any new platform or marketplace, you need to select a Default Warehouse that will act as the store fulfillment warehouse. So once a new order comes in, inventory would be deducted only from this warehouse. 

Notes:

• You need to use Multi-warehousing to manage inventory across two or more stores.

• You need to use Multi-warehousing to manage FBA inventory.  

To see the default warehouse for any channel in Cin7 Orderhive, go to Settings >> Integrations >> Open the integration >> Default warehouse.