Your inventory location will default to the shipping address that you set when setting up.
However, if you have your inventory in multiple warehouses or address, you can update this using a CSV (Excel) file.
Step 1: Finding your shipping address Ids
Firstly, you have to set up the unique address_id assigned to your locations.
Head over to Settings > Shipping
You will have your default shipping location, and the default address_id will be applied to your address.
Select + Add location to add your locations.
Step 2: Update your CSV file
You can update your stock location with a CSV file containing your sku (Stock Keeping Unit) and a header using address_id
Tip: You can use the find and replace tool to easily replace your address with your address ID
Step 3: Upload your feed file
Finally, you can upload your updated CSV through the Uploads>Feed Files Manager>Upload File
Select Stock as your import type