You use the Values tab to define one or more values for list box and drop-down control objects. To add multiple values for list boxes or drop-down lists, select Allow Multiple Selection on the Object tab.
To manipulate values for list box and drop-down control objects, perform one or more actions:
To define values for an object, enter a List Value , and then click Add.
To remove listed values, select one or more values and then click Remove
To re-order listed values, select a value, and click Move Up, then Move Up or Move Down