How to add a filter criteria as per specific field in Search Page

Summary: As part of project we have a field 'Operating Unit' OU, need to put filter criteria while searching for Account to return only tose values which are part fo the the selected OU only.

Content (required):Account Search Page and Field

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

Code Snippet (add any code snippets that support your topic, if applicable):Navigation Party --> Account --> Account Relationship --> Search based on Operating Unit.