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Hi,
States are defined in lifecycle so that if you want to modify states, you have to modify the lifecycle. In your case if you want to change the state of all objects, you shoud modify the "Basic" lifecycle. Otherwise if you want to target a specific type, you can create it and associate it a lifecycle (Object Initialization Rules).
If the state you want is not in the list, you will have to add it. Check the Windchill Customizer Guide (search roleRB or StateRB).