Supplier Eligibility for Sourcing

Summary

Configure sourcing eligibility for existing suppliers

Content

Dear experts,

Could someone help me with finding the configuration task to set the default sourcing eligibility status for existing suppliers? I have the attached screenshot, but not the navigation. 

I know I can set the default for new suppliers using task Configure Supplier Qualification Controls, but stuck on how to set for existing supplier (without having to assess and evaluate a supply base of 10,000 + suppliers).

Many thanks in advance for your support.