It seems that changing the event hierarchy is not doable all the times. Sometimes changing a subevent to main event (or Vice versa) happens easily by dragging but not always. So is there any rule for that? Also is it possible to make AND and OR Block On single level of hierarchy? Or I have to use subevent in this case.
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C for condition is technically an AND event. To make it an OR block you right click > make OR block. This is all in the same event, you don't need sub events.