The disclosure relates to a method, system, apparatus and non-transitory computer readable media for propagating placement constraints and isolation requirements, from user intents and operator policies to constituents of user requested network slices (NwSs) and communication services (CSs). The method comprises decomposing the user intents and the operator policies into functionalities corresponding to the constituents of the requested NwSs and CSs. and storing the functionalities in a solution map (SM) model. The method comprises propagating the placement constraints to the functionalities in the SM model. The method comprises propagating the isolation requirements to the functionalities in the SM model. The method comprises deploying constituent virtual network functions (VNFs) and physical network functions (PNFs) of the NwSs and CSs, according to the corresponding functionalities of the SM model.