Dear Mr. HR Krishna,
You cannot have as many ESI Sub Codes as you wish. The obtaining of an ESI Sub Code is purely based on the number of ESI-covered employees in a specific location other than the main establishment. An unjustified Sub Code number is not warranted. Employers do not have a role in choosing the ESI Local Office. Now, since most services are provided online, frequent visits to the ESI Local Office are not necessary.
What do you mean by employees' convenience?