When mapping columns headers from your files to the properties in Gamma, you will find that there are two sub-properties, one is Main Product property and the other is Outfit Product property.

The Main Product property, will be seen as your main product property like the below.

You will see the value of the Outfit Product property when the item you imported is a part of the predefined outfits you want to create, at the same time as the job import.

The products that are mapped to the Outfit product property that have not existed in the system before, will be imported as styling items which means these items will not have any production data.

Learn how to create Outfits in Gamma here.