My main form has two subforms, SubA and SubB. SubA is a simple Datasheet view to change the TimeSlot file. SubB uses a combo box, where the pick list is based upon the values in the TimeSlot file. The combo box uses Q_TimeSlotPick as the RowSource query, where the TimeSLot criteria is [Forms]![EventForm]![EvCode] (EventForm is the main form) When I make a change to the TimeSlot file in SubA, those changes aren't reflected in the SubB combo box, unless I close the EventForm and then reenter it. What do I need to requery, when and where?