Axis Object (PowerPoint)
Represents a single axis in a chart.
The Axis object is a member of the Axes collection.
Use Axes(Type, AxisGroup) where Type is the axis type and AxisGroup is the axis group to return a single Axis object. Type can be one of the following XlAxisType constants: xlCategory, xlSeries, or xlValue. AxisGroup can be one of the following XlAxisGroup constants: xlPrimary or xlSecondary. For more information, see the Axes method.
Although the following code applies to Microsoft Word, you can readily modify it to apply to PowerPoint.
The following example sets the category axis title text for the first chart in the active document.