Select the Variant tab in the product card.
Select the Product has variations checkbox.
Make any changes to the variation settings if required
and click OK.
The proposed settings are taken from the Company Settings.
Click New.
Enter the Product name.
Enter the information that applies to the variant. You can override the suggested product number. Select whether the variation is to be included as a component in a product bundle or whether the variation should be set as inactive. What properties that can be changed for the variant depends on what Variation settings you selected.
Enter specific information about the variation in the Price, Warehouse handling and Product information tabs.
Click OK.
Repeat the procedure for creating a variation until you have registered all variations of the product.
You have now successfully created a variation
of a product. 
Tip!