To generate a list of all employees assigned to a different Supervisor during the last 30 days, an Administrator can "Run an Employee Change History report and set Last Month as the Date filter" in NetSuite. This approach leverages the Employee Change History report, which tracks historical changes to employee records, including changes in reporting lines or supervisor assignments. By filtering the report to show changes within the last month, administrators can easily identify employees whose supervisor assignments have changed during the specified timeframe. This method provides a straightforward way to monitor and review changes in organizational structure or reporting relationships over time.References: NetSuite Help Center, Reporting and Analytics Documentation.