is it able to addChild only 1 QTreeWidgetItem to many other QTreeWidgetItem?
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No, because a child widget item can only have one parent (or none if it is the root)
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@opengpu2 What is your situation actually? Why do you want to use same widget item for several tree widgets? I cannot imagine any use cases. "Tricky solutions" are usually a source of troubles, keep it simple.