The contents of voluminous writings that, although admissible, cannot conveniently be examined in court may be represented in the form of a chart, summary, or calculation. Reasonably in advance of the offer of such chart, summary, or calculation, the originals or duplicates must 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.
Va. Sup. Ct. 2:1006