Dear Arabhinda,
Section 9-C of the ID Act, 1947 makes it mandatory that every industrial establishment having 20 or more no of employees has to form a grievance settlement committee comprising of equal no of representatives from employer's and employees' side to look into the grievances of employees. Similar provisions exist in the Code on Industrial Relations, 2020 which is awaiting notification for its enforcement. If my memory fails me not, non- compliance in this regard would be visited with a fine of Rs. 1 lakh under the new Code. The purpose of grievance settlement committee in every establishment is not to substitute the other modes like conciliation etc., but to prevent the escalation of disputes beyond the four walls of the establishment.
Therefore, before formulating any policy on grievance settlement for your industry, it is better for you to go through the relevant provisions under both the above enactments.