SpaceAfter Property

Returns or sets the amount of space after the last line in each paragraph of the specified text, in points or lines. Read/write Single.

Example

This example sets the spacing after paragraphs to 6 points for the text in shape two on slide one in the active presentation.

With Application.ActivePresentation.Slides(1).Shapes(2)
    With .TextFrame.TextRange.ParagraphFormat
        .LineRuleAfter = False
        .SpaceAfter = 6
    End With
End With