Dfd level 0 and level 1of inventory management system?

A Data Flow Diagram at level 0 starts with the management of products, which is controlled by the store keeper whose responsibility it is to respond to the demand for products. Level 0 is a simple flow diagram with only one channel. At level 1 an administrator will register, update, and search products then inform a store keeper of demand. The store keeper will respond to the demand and report back to the administrator.