The following ignores Ctrl+F and Ctrl+H as an example, paste this into a Module:
Global gControlKeyPressed As Boolean
Global gCancelKeyPress As Boolean
Public Function ControlKeyDown(K_Code As Integer)
If K_Code = vbKeyControl Then
gControlKeyPressed = True
End If
If gControlKeyPressed = True Then
Select Case K_Code
Case vbKeyF 'Find
gCancelKeyPress = True
Case vbKeyH 'Replace
gCancelKeyPress = True
Case Else
gCancelKeyPress = False
End Select
End If
End Function
Public Function ControlKeyUp(K_Code As Integer)
If K_Code = vbKeyControl Then
gControlKeyPressed = False
End If
End Function
In each form that you want to use this, paste:
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
ControlKeyDown (KeyCode)
If gCancelKeyPress = True Then
KeyCode = 0
gCancelKeyPress = False
End If
End Sub
Private Sub Form_KeyUp(KeyCode As Integer, Shift As Integer)
ControlKeyUp (KeyCode)
End Sub
Also in each form, set its Key Preview to Yes. You can add as many Ctrl+Key combinations as letters in the alphabet to the above.