Choose the Centra warehouse that stock is saved to when you don't use multiple warehouses.
Choose from the list – it shows the warehouses in your Centra.
Good to know
If the other system has several warehouses, the stock from all of them is added together and saved to this warehouse.
To load stock from only some warehouses, map them in Map Locations (Warehouses).
If the list is empty, check that Centra is connected. An empty list almost always means the connection, not the setting.