The IMT-2020 network in which embedded a capability exposure functionality enables 3rd party to directly use a customised network slice under certain a restriction in order to efficiently provide optimized solutions for different market scenarios which have diverse their own requirements. Automated processes for orchestration and management is also important from the perspective of efficiency. The objective of this Recommendation is to describe the requirements, architecture, key functionalities and typical procedures of network slice orchestration and management for providing network services to 3rd party in the IMT-2020 network.