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How to Manage test artifacts creation in different stream within same component in ETM

Hello,
My project area setup is as below
Project Area(under this one component)
- comp.dev(under this 2 stream)
-
Stream_dev
- Stream_execution
Now my usecase is to restrict user to create test case,test script in Stream_execution
Problem is permission and precondition are handled at project area level but is there any solution to my usecase?
Thank you