Export the Product Inventories / Inventory Options file:
If you haven't added any product inventory options yet the file will just have headers in Row 1.
There are 3 fields as follows. They are all required and all need special attention as they link to other sections.
Seller Product ID (Required)
User defined product identifier for the Product. This field needs to be the same as the seller product identifier defined in the Product Inventories General Data sheet.
Option Identifier (Required)
User defined unique identifier for the Option. This field needs to be the same as Option Identifier defined in Option export sheet.
Option Value Identifier (Required)
User defined unique identifier for the Option value. This field needs to be the same as Option Value Identifier defined in Option Value export sheet.
Once you've added all your details, save as a CSV and import the file by going to import:
Clicking on Product Inventories opens up a side panel. Select Inventory Options from the Select data dropdown list, select the csv file to be imported then press the blue import button.
The import process will only complete if the file has no errors. If the file has errors an error log (in CSV format) will download to your download folder. Open this to see any errors flagged with a description of the error. Fix the errors and re-import.