Best way would probably be to make an unbound form with unbound textboxes. Then a button, btnSaveMe and code:
Dim strSaveData as String
strSaveData = "INSERT INTO tblSomething(field1,field2,field3,field4) " _
& "SELECT field1,field2,field3,field4 " _
& "FROM tblUnbound " _
& "WHERE unboundID =...