Setting up Locations
You can have as many locations and sub-locations as you want. To set them up, select:
Cog -> Stock Control Settings
Click on 'New Location' to create a top-level location. Click on the plus sign to create a location below the current one.
Items need to be marked as 'Stock Items' before they are available to add to stock. To do this:
Select 'Items' and edit an item.
Set the tick box:
Also, see the section on managing stock.