ComboBox's HIGHLIGHTED ROW to TRIGGER Sub

Have you looked at using the combobox's MouseMove, MouseDown etc events?

You could put the code for the Change event into it's own sub and then you could call that sub from both the change and MouseMove events.

I'm not sure that's relevant.

If you want to run the same code that is triggered by the Change event from the MouseEvent then one solution is to do what I suggested.

Let's say you put the code for the change event in a sub called ComboChange in the userform module.

Sub ComboChange()
 'Userform
    TxtBx_TaskDESCRIPTION_Change
    Trm_CmbBx_TaskCODE_TxtChrctrs12
        Select Case CmbBx_TaskCODE_TxtChrctrs12
            Case Is = "CD"
                With CmbBx_OutlineSHAPE
                    .Text = "Circle"
                    .Font.Bold = True
                    .ForeColor = &H6&
                    .BorderStyle = fmBorderStyleNone
                    .SpecialEffect = fmSpecialEffectSunken
                    .Locked = True
                End With
            Case Else
                With CmbBx_OutlineSHAPE
                    .Text = "Shape"
                    .ForeColor = &H80000011
                    .Font.Bold = False
                    .BorderStyle = fmBorderStyleSingle
                    .SpecialEffect = fmSpecialEffectFlat
                    .Locked = False
                End With
        End Select
    'ShwHdFrms_DimensionsDEPTHTHICK
    'Worksheet
    DfnCll_TaskCODE
        Cll_TaskCODE = CmbBx_TaskCODE
    Cell_TaskDESCRIPTIONTxt
End Sub

You would then change the event code to this.

Private Sub CmbBx_TaskCODE_Change()
    Call ComboChange
End Sub

Private Sub CmbBx_TaskCODE_MouseMove(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)
    With CmbBx_TaskCODE
        .BorderStyle = fmBorderStyleSingle
        .SpecialEffect = fmSpecialEffectFlat
    End With
    Call ComboChange
End Sub