Change of Name of the Company Legal Process for Appointment Letters

Our Company Name is getting changed from Proprietary Concern to Private Limited company. For the existing employees is there any need to issue revised Appointment letters. Alternatively, can we issue a communication Circular to all employees informing about the change in name of the company and is it sufficient. Kindly provide me the reply to meet industrial law requirements

Since the Name/ Nomenclature of the New Entity is coming into Existence, please considr issuing Fresh Letters with New Date withoutAltering Empoyment Terms & Consditions as any Employment is a Contract Between Contracting Parties.
PF + Other Details be in the NewEstablishment's Name.
Kritarth Team, Bengaluru
29 Nov 2019

When the Proprietorship Company becomes a Limited Company, normally the transfer of employees and the service continuity, to limited Company and continuity of service would be documented, by the taken over Private Limited company in their liability clause. Once this documentation is dome, it is better to issue a individual letter intimating the change in management, and indemnification of their service continuity from previous management to present management .