Chart.ChartGroups (PowerPoint)

Returns an chartgroups that represents either a single chart group or a collection of all the chart groups in the chart.

ChartGroups (Index)

Index: The chart group number. If specified, a single ChartGroup object is returned. If omitted, a ChartGroups object is returned which contains a collection of every ChartGroup object for that chart.

Dim cgs As ChartGroups
Set cgs = ActivePresentation.Slides(1).Shapes(1).Chart.ChartGroups()