How do I make an exception to global advisory condition?

I have a Global Advisory Condition that I want to exclude or modify for a specific target.

For example I want "% Free Space - Disk" advisory condition to trigger at 5%, not 10% for "Server X". However, I can't edit Global advisory conditions. It instead prompts me to create a copy instead. Is that really what I want to do? A competing monitoring tool I used years ago was so much easier. I could just pick the server I wanted the exception for, and it would cascade the rules down by itself.