Are you sure you don't want to use a bound form? It sounds like you are creating the junction table of a many-many relationship. Typically, this is done as a subform from one side or the other, whichever makes more sense. Sometimes, you will want two forms so records can be added in either direction. For example, on a student form, you would have a subform with classes and you could add the student to a new class with this subform. You could also have a form for a class with a subform that showed students in that class which could also be used to add a student to a class. When done this way, the main form controls one of the FK fields so you only need a single combo in the sub form. In the first example, the combo would list classes and on the second example, the combo would list students.