Code

SelectionCopy copy = diagram.CopySelection(diagram, false, false);
for (int i = 0; i < copy.Items.Count; ++i)
{
	DiagramLink link = copy.Items[i] as DiagramLink;
	if (link == null)
		continue;
	DiagramLink originalLink = (DiagramLink)copy.OriginalItems[i];
	if (link.Origin is TableNode)
	{
		link.OriginIndex = originalLink.OriginIndex;
		link.OriginAnchor = originalLink.OriginAnchor;
	}
	if (link.Destination is TableNode)
	{
		link.DestinationIndex = originalLink.DestinationIndex;
		link.DestinationAnchor = originalLink.DestinationAnchor;
	}
}