Step 2 - Collection for siblings

After creating the products, place them all in one collection. The collection does not need to be used for any other purpose (it can be hidden from your storefront):

Tip: How to hide a collection from the storefront

First, ensure the collection you would like to hide is Published✅to your Online Store:

Next, add the collection to the search exclusion list in the Theme settings -> Extra Settings.

You can hide any of your collections from searches by adding them to the search exclusion list. Find this setting in the Theme settings -> Extra Settings