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Is there a way to know which reports a field is being used in?
Is there a way to know which reports a field from a specific object is being used in? And if it is used as a filter or just a column on the report?

run a report on report object. You can refer http://kell.screenstepslive.com/s/knowledgebase/m/16056/l/257090-how-to-report-on-reports-and-dashboards on step by step process