Scenarios are free-form exercises that are designed to be practiced as if you were the system administrator responsible for an implementation. Try to solve the scenario in your practice org (see Getting Started – Free if you do not have a practice org). Once solved, or if you need help, turn the page for the solution.
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I would create a list view with the criteria and then based on the filtered list react to the opportunities that are populated.
I first thought I had to create a custom opportunitiy field with an equation? I think I have to read and interpret the questioning better.
You could take that approach but it isn’t necessary to create a field.