The disclosure relates to an automated method for product ordering and other operations via the Internet, while acting as a substitute or surrogate for another entity. According to the method, a user may connect to a web site and request a list of entities (also, “partners”) for which the user is authorized to place orders or perform other operations. Nodes of a hierarchical data structure may be used to represent the entities and the user. The hierarchical data structure may be processed to determine which of the nodes the user is authorized to perform operations for. The instructions may return a list of eligible nodes to the user, filtering out ineligible nodes.