Gst rates for restaurants

sir I have roadside restaurants under my restaurant 5 stalls are there. Stalls owners are collecting GST under my GST number, later they do separate and they will give my part amount. ex: customer asked for grill item and water bottle . from one stall grill item from another stall water bottle come to customer. But billed under one GST number. later stall people shared amount and tax seperatly, so how to file my return. Restaurants percentage how much please help me