Use the multiselect function to select several controls, devices and/or actions in the drawing area at the same time and add them to:
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a basic action
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a routine
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a condition
Multiselect is only active when you can add elements to a basic action or routine.
Press and hold the Shift button and drag your mouse across the drawing area. If you wish, you can repeat this process to select additional elements.
In a question from the wizard in the context of a routine, you select only the controls and devices that are possible as an answer to this question.
Please also read Multiselect when creating an action.