This example defines a shape range that contains all the AutoShapes on the active document and then horizontally distributes the shapes in this range.
With ActiveDocument.Shapes
numShapes = .Count
If numShapes > 1 Then
numAutoShapes = 0
ReDim autoShpArray(1 To numShapes)
For i = 1 To numShapes
If .Item(i).Type = msoAutoShape Then
numAutoShapes = numAutoShapes + 1
autoShpArray(numAutoShapes) = .Item(i).Name
End If
Next
If numAutoShapes > 1 Then
ReDim Preserve autoShpArray(1 To numAutoShapes)
Set asRange = .Range(autoShpArray)
asRange.Distribute msoDistributeHorizontally, False
End If
End If
End With