To be able to import your combinations, you first need to have imported your Products file.
Why? Simply because the combinations you are going to import will append themselves to the different products you have created.
It is therefore essential that you know the ID of each of your products.
As the image above shows, you need to define one combination per row. You will then have a column that corresponds to the features you defined in your shop (Size, Shoe size, Color, etc.), and a column that corresponds to the values (size S, size 36, color Blue, etc.).
Once your table has been correctly written, you can import it into your Import configuration panel.
This works in the same way as for the Product file.