Separator Property
Allows the user to set or return the separator used for the data labels on a chart. Read/write Variant.
expression.Separator
expression Required. An expression that returns one of the objects in the Applies To list.
Remarks
The chart must first be active before you can access the data labels programmatically.
Example
This example sets the data label separator, for the first series, on the first chart, to a semi-colon.
Sub ChangeSeparator()
ActiveSheet.ChartObjects(1).Activate
ActiveChart.SeriesCollection(1) _
.DataLabels.Separator = ";"
End Sub