Ok. Thanks for replay. I was confused....
I am forced to use QTextCursor for manipulation of QTextBlocks. I just do not understand why I am not allowed to manipulate QTextBlock directly.

This means that Qt has no serious clases for work with complex text Just basic functions... and all those clases as QTextDocument, QTextList... and similar are not of much use for me. Not eaven for simple bullet lists.
For what I nead I must reimplement all classes used in project and create new clases from scratch.