How to restrict the Business Unit for Hiring Manger in Create job requisition page

Summary:

The requirement is on the create job requisition page for hiring manager to restrict the list of business units, only to the one they belongs to.

List of position can be restricted using position hierarchy in position security profile.

Also how to restrict the organization values to same as the business unit that was selected in basic info section.?

Content (please ensure you mask any confidential information):

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

Code Snippet (add any code snippets that support your topic, if applicable):