xlChartSplitType

Specifies the values displayed in the second chart in a pie chart or a bar of pie chart.

xlSplitByCustomSplit	Arbitrary slides are displayed in the second chart (4)
xlSplitByPercentValue	Second chart displays values less than some percentage of the total value The percentage is specified by the splitvalue property (3)
xlSplitByPosition	Second chart displays the smallest values in the data series The number of values to display is specified by the SplitValue property (1)
xlSplitByValue	Second chart displays values less than the value specified by the SplitValue property (2)

xlSplitByCustomSplit

Arbitrary slides are displayed in the second chart (4)

xlSplitByPercentValue

Second chart displays values less than some percentage of the total value
The percentage is specified by the splitvalue property (3)

xlSplitByPosition

Second chart displays the smallest values in the data series
The number of values to display is specified by the SplitValue property (1)

xlSplitByValue

Second chart displays values less than the value specified by the SplitValue property (2)