If you have already created the products in your account, and need to link or relink the variations, this can be done in two ways.
From the Neto Dashboard, navigate to Products > View Products.
Select the product by clicking the product SKU.
In the Naming & Visibility section click the three dots next to field called Parent and select Change.
Click on the field under Change Parent and enter the parent SKU or name.
Select the parent from the search results and Save the changes.