N.C. Gen. Stat. § 8C-1, Rule 1006: Summaries.

The contents of voluminous writings, recordings, or photographs which cannot conveniently be examined in court may be presented in the form of a chart, summary, or calculation. The originals, or duplicates, shall be made available for examination or copying, or both, by other parties at a reasonable time and place. The court may order that they be produced in court. (1983, c. 701, s. 1.)