Sub Main()
Dim doc As ProductDocument
Set doc = CATIA.ActiveDocument
Dim rootPrd As Product
Set rootPrd = doc.Product
ClearDescription rootPrd
End Sub
Sub ClearDescription(prd As Product)
prd.DescriptionInst = ""
Dim subPrd As Product
For Each subPrd In prd.Products
ClearDescription subPrd
Next
End Sub