A family of Microsoft relational database management systems designed for ease of use.
You first have to move focus from the subform by setting it to any control in the parent form. You can then hide the subform control:
Me.Parent.cboOffice.SetFocus
Me.Parent.ResourceCSubform.Visible = False
where cboOffice is the combo box in your parent form, and ResourceCSubform is the name of the subform control, i.e. the control which houses the subform. This might or might not be the same as the name of its source form object.