In a network management system communicatively coupled to a plurality of domains, each domain has a plurality of resources including physical resources and/or virtual resources executed on corresponding computing devices, each domain provides a plurality of services including one or more of computing services, storage services, network services, and combinations thereof via the plurality of resources, systems and methods include identifying a collection of the plurality of resources and/or the plurality of services as a fusion object; managing the fusion object via a set of Application Program Interfaces (APIs) to perform management of the collection as a single manageable entity; and updating the fusion object based on one or more of network topology changes in the plurality of domains, resource changes in the plurality of domains, and service changes in the plurality of domains.