Adding a Property to a Property List
Add a new property to a property list using the property list editor.
In the property list editor, hold the pointer over an entry and click the Add (+) button.
Choose a key name from the pop-up menu.
Choose a value from the pop-up menu in the Value column or enter a value.
If you are adding a property that is an array or dictionary, click the disclosure triangle and press Return to add a child property.
You can add a property with a name that is not in the pop-up menu. To do so, type the key name in the field at the top of the pop-up menu, choose the data type from the pop-up menu in the Type column, and enter a value in the Value column.