Hi @rv13 Welcome to the Community! It is not possible to have a different subdomain for all the 30 Affiliates, but you can have different pages for all the affiliates and you can achieve this by adding the pages in the pages section under the Online store.
Or
If you want to have different subdomain for all the affiliates then you need to host those pages on the hosting provider and then connect those pages url with the shopify.
Hopefully I am clear and it will help you. If yes then Please don’t forget hit Like and Mark it as solution!
Best Regards
Sahil