Question-and-Answer Resource for the Building Energy Modeling Community
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Kind of an odd approach, but you can load any model as a library in OpenStudio (using the file menu, load library) and there isn't any reason that can't be your current model. Then you can drag the schedule into your model. Each time you do that it will clone it.
Also if working in a measure you can use this call to clone a ruleset schedule.
my_schedule_ruleset.clone.to_ScheduleRuleset.get
