Represents series lines in the specified chart group. Series lines connect the data values in each series. Only 2-D stacked-bar or column chart groups can have series lines. This object isn't a collection. There's no object that represents a single series line; either you have series lines turned on for all points in a chart group or you have them turned off.
Using the SeriesLines Object
Use the SeriesLines property to return the SeriesLines object. The following example adds series lines to chart group one in the chart. The chart must be a 2-D stacked-bar or column chart.
With myChart.ChartGroups(1) .HasSeriesLines = True .SeriesLines.Border.Color = RGB(0, 0, 255) End With
If the HasSeriesLines property is False, most properties of the SeriesLines object are disabled.