To select options in a multi-selection drop-down list:
Click the down arrow on the right side of the field. The multi-selection drop-down list is displayed.
Select the check box next to the applicable option(s) in the list.
If you select one or two options in the list, the selections are displayed in the drop-down field.
If you select more than two options in the list, the number of options selected out of the total number of options available is displayed in the drop-down field.
If you select the Select all option, all options in the list are selected.
You can clear a selected option by selecting the check box again.
Click outside the drop-down list to close the multi-selection list.