How do I set the control source of a combo box to the subform

[Canadiangal]

How do you set the control source of a combo box to the subform?



Combo box called DD3
Subform called Dataentry subform

I don't see an option under control source to set it to the subform itself.

[June7]

A ControlSource can be a reference to a field so that the box is bound or an expression such as: =Qty*Price

A ControlSource cannot be a reference to a subform.