Chart.ChartGroups (Word)

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, which contains a collection of every ChartGroup object for that chart, is returned.

With ActiveDocument.InlineShapes(1).Chart.ChartGroups(1) 
 .HasUpDownBars = True 
 .DownBars.Interior.ColorIndex = 3 
 .UpBars.Interior.ColorIndex = 5 
End With