Select the top-level design or a component in the Structure tree. You can
select more than one component.
Right-click in the Properties panel and select Add Document Property
to create a custom property.
Expand the property to display its value.
Enter a name for the property, select its type (date, Boolean, number, or
string), and enter its value.Delete a custom property by
right-clicking the property in the Properties panel and selecting Delete
Document Property.
