Sometimes, it can be hard to find the ASIN of the parent or child of a variation, or to determine if the variation you're looking for exists. You can use the Variation Wizard tool in Seller Central. Just follow the below steps:
1. In Seller Central, navigate to Inventory > Add a Product.
2. Click Add a Variation using Variation Wizard.
3. Click on Add to or update existing variation family. Search for the ASIN you do have, such as a child or the parent.
4. From here, you can see the Parent ASINs and all of the Child ASINs associated with that listing. Be sure to pay attention to the variation features such as Size or Color to make sure you are choosing the color ASIN to list against. Sometimes, the titles are incorrect. If you find this to be the case for your listing, you can reach out to Seller Support's Detail Page team to have the variation corrected.