How to map departments to a specific Business Unit using HCM Security Profile

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Hi Team,

I have created a Organization Security Profile and in the Tree Structure i am using my Organization Tree which contains the entire organization hirearchy. I want to restrict departments based on specific Business Unit but it just displays all the departments irrespective of the BU selected. Please let me know if someone has done this or any suggestion?

In my Organization Tree, i have 2 Legal Entites, 2 Business Units under each LE (so 4 in total) and each Business Unit has 2 Departments under it. I created security profiles and assigned to user who has access only to these 2 LEs. The Issue i am seeing is when i perform Hire an Employee wherein we select the Business Unit, so here no matter which BU i select all the departments are getting display and it is not restricting the departments as per BUs.