Hi,

follow this steps:

1. activate "variants" feature in Inventory Settings

2. use this steps to import products with variants:

2.1 create your attribute like this:

if you want to import variants in excel then use this template:

Note: you can add description row for your customer to define each column

2.2. import product template:

Notes:

 - you can not create product variant barcode from this

- some fields are generic for product like (UoM, inventory tab info,......)

- some fields are dedicated for each variant like(barcode , internal reference, cost, price ,.......)

excel template:

also you can add custom fields to describe the meaning of particular fields but remove it before importing process