Creating a new variation product
Navigate to Products > All Products. Click the "Add Product" button located on the top-right corner of the page.
Click the "Variations Present" box, then select which variation attributes you would like to add (Size, Color, etc.). You can also create your own variation attribute if the available options do not apply to your product.
Once you have added your variation attributes and values, click "Generate Variations." From here, you can enter your inventory quantities for each variation. Scroll to the bottom of this page and click "Save Product."
Creating a Variation Product from an existing single product
Locate the product you would like to add variations to, then navigate to the "Variations" tab within the product page. From here, click "Add Variations."
Select the variation attribute or create a new one. This will turn your current product into a variation, so you will need to add a parent SKU and provide a value for the variation attribute you just added.
You can click the "Add Variation" button to continue adding more variations to this product.
Click "Save" when you are done.