Thank you for posting your query on Microsoft Q&A, from above description I could understand that you are looking to create multiple management dashboards within M365 Defender admin console.
Please do correct me if this is not the ask by responding in the comments section.
M365 Defender admin console (security.microsoft.com) does not support creating multiple management dashboards with different access levels. However, you can assign different roles to users or groups to control their access to different features and data within the Microsoft Defender for Endpoint portal.
Still if you feel this is impacting your business needs then I would recommend you creating a M365 defender feedback request.
Please "Accept the answer (Yes)" and "share your feedback ". This will help us and others in the community as well.
Thanks,
Akshay Kaushik