How to create a separate class from pyqt elements and instantiate its objects in the main interface?

Question

PyQt

I created a form in qtDesinger and try to split the elements into classes, so that when I click on certain components, I create them?

as shown in the example, I tried to cut the code and paste it into a separate class.
Then I wrote a method

def addAnswerItem():
        Ui_Answer(MainWindow)

And he tried to call:
ui.add_button.clicked.connect(addAnswerItem)
As you understand, it did not work.

The idea is to destructure in order to add or remove dynamically whole blocks from the form later.