A change and update system for network-based knowledgebase (KB) sales and service facilities has a user interface (UI) system for accessing the facility over the network, software at the facility for negotiating with the user interface, and a state component at the facility storing state data for a configured order or service at the facility, the state data including a summary of the order or service and information regarding allowable alterations and effects of alterations. A user communicates through the user interface with the software at the facility, which negotiates changes to an existing order or service configuration using data from the state component, and the software, as a result of the negotiation, updates the configured order or service configuration with the negotiated changes.