This example sets the line spacing for the first paragraph in the active document to always be at least 12 points.
With ActiveDocument.Paragraphs(1)
.LineSpacingRule = wdLineSpaceAtLeast
.LineSpacing = 12
End With
This example triple-spaces the lines in the selected paragraphs.
With Selection.Paragraphs
.LineSpacingRule = wdLineSpaceMultiple
.LineSpacing = LinesToPoints(3)
End With