Is this a userform? You can loop through the controls collection e.g.
Code:
Dim i As Integer
Dim oCtrl As Control
For Each oCtrl In Controls
If TypeName(oCtrl) = "ComboBox" Then
If oCtrl.value = "Pickup" Then
'do stuff with oCtrl e.g.
MsgBox oCtrl.Name
Exit For
End If
End If
Next oCtrl