Final answer:
With appropriate security permissions, users can add additional columns to the report's available columns list for customization purposes.
Step-by-step explanation:
True to the statement, with the provision of appropriate security, it is indeed possible to add additional columns to the list of available columns in a report. Security permissions can dictate what modifications can be made to a report's structure, ensuring data integrity and compliance with organizational policies. When given adequate permissions, users or administrators can customize reports to better fit their data analysis needs by inserting new columns that may represent different data fields or calculated values.