How to restrict positions based on the business unit?

Summary:

We have a requirement where positions should be restricted to a specific business unit when Position quick actions like "Request a new Position" and "Request a position change" are performed by a line manager

I have created a Position Security profile and secured it by Business unit. When I tested by logging in with Line manager no positions are appearing. How to resolve this and achieve the expected Output.

Please provide your valuable inputs on this. Thanks in Advance.

Version (include the version you are using, if applicable): 23C