You can only add properties from the Property Tree Browse Window.
Open the Property Tree Browse window
Highlight the parent property for the property you wish to add. If you want to add a property at the highest level, highlight the word "Property" at the top of the tree browse window.
Choose New from the File menu
OR
Choose New from the popup menu
OR
Click the New toolbar button.
Pinnacle will open the Property Details window, and will add a new blank property for you.
Type in the Property details.
Choose Save from the File menu
OR
Choose Save from the popup menu
OR
Click the Save toolbar button.