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As the article (https://help.webex.com/en-us/article/o0p0l4/Simultaneous-interpretation-in-Webex-meetings-and-webinars#Cisco_Reference.dita_c3fec2eb-60ea-4823-931f-b9524d0705f4)
says:
You can't create breakout sessions or practice sessions in meetings and webinars if you enable simultaneous interpretation when scheduling from your Webex site.
Another idea similar to this:
https://ciscocollabcustomer.ideas.aha.io/ideas/WXCUST-I-6437