Hi Harald
welcome to the Atlassian community.
https://confluence.atlassian.com/adminjiraserver/managing-groups-938847035.html
https://confluence.atlassian.com/adminjiraserver/view-create-or-delete-a-group-938847038.html
provide the details on group management in Jira
As a user with admin permissions, you go to the user management / group browser type the new group name in the Add Group form and click Add Group
The group itself can than be referenced in your permission schemes
Cheers
Kurt
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