brotherton-erpnext/erpnext/docs/user/manual/en/stock/item/item-variants.md

A Item Variant is a different version of a Item, such as differing sizes or differing colours. Without Item variants, you would have to treat the small, medium and large versions of a t-shirt as three separate Items; Item variants let you treat the small, medium and large versions of a t-shirt as variations of the same Item.

To use Item Variants in ERPNext, create an Item and check 'Has Variants'

• The Item shall then be referred as a 'Template'

On selecting 'Has Variants' a table shall appear. Specify the variant attributes for the Item in the table. In case the attribute has Numeric Values, you can specify the range and increment values here.

Note: You cannot make Transactions against a 'Template'

To create 'Item Variants' against a 'Template' select 'Make Variants'

To learn more about setting Attributes Master check Item Attributes