Hi @Mohamed_Akeel: In each step, route the case to a work basket. In the work basket you can configure security by assigning a role to it. Doing so, only the persons who has the role will be work upon the work objects from that work basket. Please refer https://academy.pega.com/topic/securing-work-queues-and-attachments/v1 for more details. Configure the access groups accordingly with the roles.

For routing please refer: https://academy.pega.com/topic/routing-work/v3

Please let us know if this helps.

Thanks.