Sub aligner()
Dim sld As Slide
Dim L As Long
Dim sn As String
sn = InputBox("Entrez le nom de la forme")
On Error Resume Next
For Each sld In ActiveWindow.Selection.SlideRange
For L = sld.Shapes.Count To 1 Step -1
If sld.Shapes(L).Name = sn Then sld.Shapes(L).Range.Align msoAlignBottoms, msoTrue
Next L
Next sld
End Sub