Back office functionalities

Hi everybody, I have already website and i want to add, to the back office some functionalities. Creating pages providers. - Creating pages in management: supplier management, reference management and rates, correspondence management articles and reference provider, management making day per lot. - Creating pages of Purchasing Management. Creating pages in management: purchasing management with date rates and supplier management summary of the total purchases by vendor, management summary of references ordered by provider per year - Creating pages of store management Creating pages in management: store management and storage locations, reception management packages and storage items - Creating pages of inventory management. Creation of management pages: VMI items and suppliers, stock management and inventory by location, recovery items pages sites for display stock - Creation / management pages of orders. Resumption of the page order management with manual selection of the product in stock, canceled orders and product. Resumption of good preparation with supplier and store location. Creating a page invoice management. Adding a module for manual delivery of products (cancellation of part of the order). Resumption of the order detail page for cancellation and return of product (mention of return). - Page creation management statistics. Production of a page management statistics sales by brand and model.