A building technology system for a large complex having multiple sections, wherein said multiple sections comprise a set of redundant sections (72S-76S, 78S-89S) in the complex, the building technology system comprising: - physical devices (14, 16) in the redundant sections (72S-76S, 78S-89S) comprising at least one light and one sensor located in each redundant section (72S-76S, 78S-89S) and at least one section controller associated with the respective section, wherein a data network is connected to the physical devices (14, 16) in the sections (72S-76S, 78S-89S), and wherein each physical device (14, 16) has a network address; - a cloud server connected to the data network and comprising commissioning software, the cloud server being configured to: - create a plan of virtual devices and logical functions for the set of redundant sections (72S-76S, 78S-89S), wherein the virtual devices are selected to match physical devices (14, 16) in or associated with the plan for the set of redundant sections (72S-76S, 78S-89S); - create a reference copy of the plan of virtual devices for each redundant section (72S-76S, 78S-89S); and - bind the network addresses of physical devices (14, 16) identified in a physical location of each redundant section by means of ID keys ID key to the respective virtual devices in the reference copy of the plan for the respective section; - a building control system connected to the data network and configured to manage logical functions of the respective physical devices (14, 16); and - a mobile commissioning device connected to the data network and configured to: - assist in identifying locations of the physical devices (14, 16) connected to the data network; and - create relations to the network addresses of physical devices (14, 16) whose locations were identified by binding unique section ID keys to unique physical device ID keys and to virtual device ID keys; wherein - the cloud server is configured to provision the building control system based on the reference copies after the virtual devices in the respective reference copy are binded to the network addresses of the identified physical devices (14, 16). - physical devices (14, 16) in the redundant sections (72S-76S, 78S-89S) comprising at least one light and one sensor located in each redundant section (72S-76S, 78S-89S) and at least one section controller associated with the respective section, wherein a data network is connected to the physical devices (14, 16) in the sections (72S-76S, 78S-89S), and - a cloud server connected to the data network and comprising commissioning software, the cloud server being configured to: - create a plan of virtual devices and logical functions for the set of redundant sections (72S-76S, 78S-89S), wherein the virtual devices are selected to match physical devices (14, 16) in or associated with the plan for the set of redundant sections (72S-76S, 78S-89S); - create a reference copy of the plan of virtual devices for each redundant section (72S-76S, 78S-89S); and - bind the network addresses of physical devices (14, 16) identified in a physical location of each redundant section by means of ID keys ID key to the respective virtual devices in the reference copy of the plan for the respective section; - create a plan of virtual devices and logical functions for the set of redundant sections (72S-76S, 78S-89S), wherein the virtual devices are selected to match physical devices (14, 16) in or associated with the plan for the set of redundant sections (72S-76S, 78S-89S); - create a reference copy of the plan of virtual devices for each redundant section (72S-76S, 78S-89S); and - bind the network addresses of physical devices (14, 16) identified in a physical location of each redundant section by means of ID keys ID key to the respective virtual devices in the reference copy of the plan for the respective section; - a building control system connected to the data network and configured to manage logical functions of the respective physical devices (14, 16); and - a mobile commissioning device connected to the data network and configured to: - assist in identifying locations of the physical devices (14, 16) connected to the data network; and - create relations to the network addresses of physical devices (14, 16) whose locations were identified by binding unique section ID keys to unique physical device ID keys and to virtual device ID keys; wherein - assist in identifying locations of the physical devices (14, 16) connected to the data network; and - create relations to the network addresses of physical devices (14, 16) whose locations were identified by binding unique section ID keys to unique physical device ID keys and to virtual device ID keys; wherein - the cloud server is configured to provision the building control system based on the reference copies after the virtual devices in the respective reference copy are binded to the network addresses of the identified physical devices (14, 16).