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To do this, you first manually create the different Startgroups yourself. You can read how that works here: https://www.athletics.app/faq/?qa=215/registrants-technical-numbers-choose-between-startgroups&show=215#q215
Once you have created all the startgroups, you can then divide the competitors over the different startgroups: https://www.athletics.app/faq/?qa=392/hoe-kan-een-eenvoudige-manier-atleten-indelen-startgroups&show=392#q392