I work in an IT company under the HR Department. The management has decided to issue a new appointment letter to every employee under another company. For example, all employees of X, Y, and Z are appointed under X company. There are also other employees under Y and Z companies. The X company is going to be abolished, and some employees will be under Y, while some will be under Z company. Should I issue new appointment letters to all the employees? What will be the right way to solve the problem? Please suggest to me.