To see what are product variations and how to add one, see this article: https://discodery.zendesk.com/hc/en-us/articles/360035094452
By default, you have 2 variation types available: Color and Size. However, you can create as many variation types as you want to fit your needs.
To do so, follow these instructions:
- Go to your Gravity Board > Offer
- Click on the "Variations Types" tab
- Click on the "Create" button
- Enter the name of your variation type
- That's it!