Please help if you can:

I have a combo box on a form (frmTest) that contains zipcodes.  In the
'notinlist' function, I have working code that asks, "Do you want to add
'11122' to the zipcode table?" Yes/No.  If you choose yes, then the data
entry form (frmZipcode) opens to add a zipcode, city, and state.  Closing
this form saves the new zip, etc.; closes the zip data entry, and advances to
the next new record on frmTest.

The problem:  If a person enters a zipcode (22211) on frmTest, and they
choose to enter it into frmZipcode, I do NOT want them to have to retype the
zipcode on frmZipcode...I want it to 'carry over' from the first form where
they first entered it.  I know that I'm missing something easy
here...something wrong with referencing the field or something.  I would
greatly appreciate any help.

Here's the code on the not in list:
Public Sub Zip_NotInList(NewData As String, Response As Integer)

   If MsgBox("Do you want to add '" & NewData & "' to the zipcode table?",
vbOKCancel, "Add New Item?") = vbOK Then
       
       'Remove new data from combo box so control requeries
       DoCmd.RunCommand acCmdUndo
               
       'Display Zipcode form to collect new data.
       DoCmd.OpenForm "frmtblZipcode", acNormal, , , acFormAdd, acDialog,
NewData
 
     
       'Continue without displaying default error message.
       Response = acDataErrAdded
   Else
       Response = acDataErrContinue
   End If
   
   
End Sub

============
I was trying something like:
Forms![frmtblZipcode]![Zipcode] = NewData

HELP!!!!!!!!!!!!!!

Have a great day,
Marjorie