Each product by default has one variant - itself. By using properties you can define different variants for the same product. Each variant is treated as a separate product in terms of stock tracking and reporting. Each variant has it's own unique SKU number.
In order to create variants you need to add property values to the product. Click on Edit option. 
This opens Product Details page.
- All defined product variants are listed in the Products table.
- Enter property values (sizes, colors, etc.) and Backstore will suggest product variants based on those properties. You can click on the [+] button to add a suggested variants.
- Delete product variant - To delete a certain variant, click on the delete icon in the table. The variant can't be removed if it is used on any price list or document.
- Click on [SAVE] button or press F9 keyboard key to save the changes, or click on the [CANCEL] button to ignore the changes.