Create a composite state by nesting one or more levels of states within one state. You can also place start/end states and history states inside of a state, and draw transitions among the contained substates.
Using Drag and drop to create a nested substate:
Place a state element on the diagram background.
Drag the new state on top of an existing state.
Drop the new state.
Right click on the state that will be the container.
Select New > State.
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