I have tried two different events
Public Sub txtFees_Exit(Cancel As Integer)
MyRoutine
End Sub
and
Private Sub txtFees_AfterUpdate()
MyRoutine
End Sub
Neither works in the subform. I am creating a total amount field on the main form. The subform has the various records so when when the fees field changes, or a new record is added and a fee in input, I want the total to reflect that.