How to mark candidates for obfuscation

Summary

List of Person/Candidate Numbers Rejected by the Data Disposal Process (only terminated workers or candidates marked for obfuscation are allowed)

Content

How to mark the candidate for obfuscation ?

Is there a api or process to mark them for deletion in bulk before running this process ?

I have just run the process and it gives this rejection message

"List of Person/Candidate Numbers Rejected by the Data Disposal Process (only terminated workers or candidates marked for obfuscation are allowed)" , I understand the worker but want to know how can I mark candidate for deletion.

 

Is it simply doing this  :