This documentation was deprecated 08/01/17. Information here may be incomplete or out of date.
You'll need to invent a unique sku (Stock Keeping Unit) for each product we're handling. Sku's can be a mix of letters and numbers, without spaces, around 12 characters or less. If your product has an official UPC, you should use that for your SKU instead of creating one.
Let's say you've got a shirt called 'Bird on a Wire' that comes in red and black, mens and womens, sizes S-XL. That's a total of 16 skus. A good way to create them is like so:
So your 16 sku's might be:
The SKU De-duplicator is also accessed in your Account > Preferences Menu.