"What is 'Substitutory of current company'? Is it that you run a company and you want to form another company, or have you already formed a new company which will replace the functions of the existing company, and for that, all the employees should be transferred to the new company? If this is the idea, then there are several things to be taken care of.
Understanding between managements and employees
First, there should be an understanding among the management of the existing company, the management of the new company, and the employees regarding their length of service, treatment of service for payment of gratuity and other terminal benefits, treatment of unavailed leaves, treatment of service conditions including salaries and allowances, retirement age, etc. Without any understanding about how to calculate gratuity in the new establishment, you should not transfer the employees from the existing company to the new company.
Agreement with employees
If the new company is ready to consider the service of the employees in the existing company, that should be clearly mentioned in the agreement with the employees. In the absence of such an agreement, the existing company should be able to settle the gratuity and compensation for retrenchment under Section 25FFF or 25FFA of the Industrial Disputes Act. In such a scenario, it will be termination of employment from the existing company and then issuing a new appointment letter and joining the new establishment thereafter. At the same time, if the service conditions remain unchanged, and the length of service is considered, then any office order evidencing the same would be sufficient to transfer the employees.
Process of exiting and registering employees
In addition to the above, you will have to take care of the process of exiting the employees from the EPF of the existing company and registering them in the new company on the next day itself. The same should be done for ESI also."