PySide2 Promoted widget for Qt5 designer
Unsolved
Qt for Python
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Hey @Pradson
The general information on promoting widgets can be found here https://doc.qt.io/qt-6/designer-using-custom-widgets.html that should work similarly for PySide.
Maybe you can share more details on what you are trying to achieve?
Because you mentioned 'cusstom widget' maybe it's worth for you to read this https://doc.qt.io/qtforpython/tutorials/basictutorial/uifiles.html#designer-custom-widgets which is the way to include custom widgets within Designer.