Transport network virtualization provides the necessary data and control plane technologies as key enablers of future networks. The interaction between network slicing and optical-transport network virtualization architectures is under study to automate effective network resource orchestration.In this paper, we present an harmonized network slicing and transport network virtualization architecture, including a network slice planner tool, which is designed and implemented enabling in-operation execution of network slice resource allocation algorithms. We validate the proposed architecture by providing a novel resource allocation algorithm, evaluating its performance, and deploying two different slices on top of the ADRENALINE Testbed, while measuring both slices key performance indicators.