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Network slicing is one of the central features of 5G networks and beyond. Slicing enables network operators to provide differentiated services to customers by dynamically allocating dedicated parts of their networks. To take full benefit of Slicing, we focus on its life-cycle management by paying special attention to automation for more overall network efficiency, OPEX savings and time-to-market acceleration. We address the modeling, orchestration and enforcement of an end-to-end (E2E) network slice, which involves the RAN, transport and Core networks. The slice management is performed while using a carrier-grade automation platform, namely the so-called Open Network Automation Platform (ONAP). As an illustrating use-case, we consider a private mobile network deployed over a virtualized infrastructure.