Formal:
* संबंधित अधिकारी/व्यक्ति को (Sambandhit adhikari/vyakti ko): This literally means "To the concerned official/person."
* संबंधित सभी को (Sambandhit sabhi ko): This means "To all concerned."
* जिसको यह संबंधित हो (Jisko yeh sambandhit ho): This is a more literal translation, meaning "To whom this is relevant."
Informal:
* जिसको भी यह चाहिए (Jisko bhi yeh chahiye): This means "To whoever needs this."
* संबंधित व्यक्ति/विभाग (Sambandhit vyakti/vibhaag): This means "Concerned person/department."
The best option depends on the specific situation and the level of formality you want to maintain.