Let's say you want to search CEOs of specific domains that you have, you can easily do so by using the combination of "Include Companies" Filter and "Job titles" filter.
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Step one: Insert the domains by copy pasting them in the include domains field
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Step two: Go to job titles and select "CEO"
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Step 3: Select Max people per company and Click Next Step
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Step 4: Insert your credits and your good to go!