1. In form's declarations area, create a private variable:
Private mSaveValue As Integer
2. Put the following code in the form's After Update event:
mSaveValue = ToControlName.Value
3. Put the following code in the form's On Current event:
FromControlName.Value = mSaveValue
The .Value for the control names are optional, just helps to make your code a little more self documenting.
Good Luck!