I am not sure what you mean.

The property editor iterates over the properties and displays them grouped by the class they are declared in, starting with QObject, ending with the actual class itself.

E.g. if you look at the properties of a QPushButton, the first section has the properties of QObject, then QWidget, then QAbstractButton, then QPushButton.

So if you derive from QPushButton and add another property, it will be in its own section, following the QPushButton section.

Cheers,
_