Debut theme, how to add variant for different fragrances for my products

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I am in the process of setting up my shop, I sell bath and body products with different fragrances.  In products, variants I have the option of color, size and material. How do I add a variant for fragrance so that when a customer wants to buy a lotion they are able to click on drop-down menu to choose different fragrance type.  I searched this community, facebook and utube but cannot find the answer.  Thank you