If you want to add a local variable to this field set, but the local variables tab in the Field tab contains no items to select, first define the local variable in Field Set Editor: Local Variables Tab.
In the Available Fields for <type of> Field Set section at the Local Variables tab, select a local variable that you have defined in Field Set Editor: Local Variables Tab.
Select the check box for the local variable you want to add to the field set.
To re-order the local variables in the list, select a field and use the up/down arrows to place it in the desired order. The variables will be evaluated in the order shown here.
To remove the local variable from the list, select the field and click the delete button ().