Did you delete it from your layout or from Manage | Database | Fields?
If you deleted it from the layout, enter layout mode and drag the field tool from the status toolbar onto your layout to create a new field object on your layout. Select your field from the list that pops up in a dialog. Then, with the new field selected, go to the Data tab in the inspector and change the field format from edit box to dropdown list and select the value list that you had originally selected.
Thanks I have sorted it!