Draw a painting in Qt designer

[Nafab213]

Hi PI45m4
I thank you for the time you give me.
I would like to build this table but I do not know how to merge the cells to have this presentation when the window is displayed. I build the table in Qt Designer.
Here is the picture of the painting.
How to merge cells ?
Thanks in advance...

[Nafab213]

[mrjj]

Hi
there is
https://doc.qt.io/qt-5/qtableview.html#setSpan