Finding Leads on Clay: Excluding ISO Certified Companies Explained

Hi Clay support team, I have a few questions, but I will describe the first situation here. Im tryign to find leads for my company using Clauy and I set up a column where you can see that I ask for companies with and without an ISO certification. When I use the find people option how can I ensure that it will exclude people from companies where it says certified? I did not get it with the column filtering options