A Sub-Affiliate is created when you work with a network/agency that also has its own SUPPRESS account.  In this scenario, the partner will create a Linked List in their account which allows them to connect to your system at a Suppression List level.  Here is an article that speaks a little further about it: What is a Linked List?

You can find a Sub-Affiliate in your account by going to an Affiliate's profile page and scrolling down to the section called Sub-Affiliates.  To learn more about the Affiliate's Profile page, please review this article: How do I View the Activity of a Affiliate?

If you have further questions, please contact us: support@optizmo.com