Transfer of materials without payment of duty

We have a Plant in Mumbai situated at Small plot there are no space for Raw Material as well as FG. So we have to kept RM & FG both at seprate warehouse. This ware house is situated in mumbai only but difference Range. Now I want to serch a way by which we may Taken in RM from WH to Plant without paymen of duty and also take FG out to warehouse from plant without payment of duty. Please help me with all of your eaperties on the same.