US Patent 10915859 Systems and methods for order filling

In some embodiments, a method can comprise retrieving an inventory layout of a facility and determining multiple pick lists at the facility. A first pick list for a first user and a second pick list of a second user each comprise a first common item. Receiving a first indication from the first mobile device that the first common item is not available at the facility. Analyzing a first set of rules of a substitute system to locate a first substitute item that is within a first predetermined percentage of a size of the first common item. After analyzing the first set of rules, automatically sending instructions to transfer the first route and the first pick list to the first mobile device.