Hi Matt,

This is the macro from the web page, modified to work with your dropdowns.
Assign this macro as the exit macro for each dropdown that needs this kind
of redirection, and create a case for each dropdown following the models I
show:

Sub TabOrder()

Dim StrCurFFld As String, StrFFldToGoTo As String

'First get the name of the current formfield
If Selection.FormFields.Count = 1 Then
   'No textbox but a check- or listbox
   StrCurFFld = Selection.FormFields(1).Name
ElseIf Selection.FormFields.Count = 0 And _
       Selection.Bookmarks.Count > 0 Then
   'Textbox
   StrCurFFld = _
       Selection.Bookmarks(Selection.Bookmarks.Count).Name
End If

'Then find out which formfield to go to next ...
Select Case StrCurFFld
    Case "Q3a"
       ' the dropdown's "value" is the number
       ' of the selected item, starting from 1
       If Selection.FormFields(1).DropDown.Value = 3 Then
           ' selected "None", the 3rd item
           ' so skip to next dropdown
           StrFFldToGoTo = "Q4a"
       Else
           ' selected something else, so
           ' continue to next text field in this group
           StrFFldToGoTo = "Q3b"
       End If
    Case "Q4a"
       If Selection.FormFields(1).DropDown.Value = 2 Then
           ' selected "No", the 2nd item
           StrFFldToGoTo = "Q5a"
       Else
           StrFFldToGoTo = "Q4b"
       End If
    Case Else
       ' any other field that doesn't need redirection
       StrFFldToGoTo = ""
End Select

' ... and go to it
' or just go to the next field if StrFFldToGoTo = ""
If StrFFldToGoTo <> "" Then
   ' if the destination is a text formfield,
   ' use the more complicated selection method
   If ActiveDocument.FormFields(StrFFldToGoTo).Type = _
           wdFieldFormTextInput Then
       ActiveDocument.Bookmarks(StrFFldToGoTo).Range _
           .Fields(1).Result.Select
   Else
       ActiveDocument.FormFields(StrFFldToGoTo).Select
   End If
End If

End Sub

In testing this macro, I found that the .Select statement at the end of the
original version will select only a text formfield. If you want the
selection to jump to the next dropdown, you need the other .Select statement
shown here.