Query - Select items not on form

[santosm]

Hi All,
I have a form (and subform) with a number of equipment IDs on it. I have another control that is a combo box and I want to show the other equip IDs that are not already on the form. So, in short, I have IDs 1-4 on the subform already and I want the combo box to only show me IDs 5 and up since 1-4 are already on the subform. In what method do I need to structure a query to return records that are not already listed?

Thanks,
Mark

[HansV]

Can you tell us how the form and subform are related?