SeriesCollection Method
Returns an object that represents either a single series or a collection of all the series in the chart or chart group.
expression.SeriesCollection(Index)
expression Required. An expression that returns one of the objects in the Applies To list.
Index Optional Variant. The name or number of the series.
Example
This example turns on data labels for series one.
myChart.SeriesCollection(1).HasDataLabels = True