Before you can do anything with those particular bullets, you'll need to convert them to manual bullets - right now, they're automatic bullets. Try:
Code:
Sub ReplaceBullets()
Dim Para As Paragraph, Rng As Range
For Each Para In ActiveDocument.Range.Paragraphs
With Para.Range
If .Text Like "?" & vbTab & "*" Then
Set Rng = .Duplicate
With Rng
.End = .Start + 2
.Text = vbNullString
.InsertBefore Chr(149) & vbTab
End With
End If
End With
Next
End Sub