There are provided measures for realization of service level agreements in network slice scenarios joining multiple network capabilities. Such measures exemplarily comprise, as a slice management entity, receiving a network resource combination request, transmitting a request for at least one area base unit fulfilling, receiving, from said area base units repository, area base units fulfilling said at least one predetermined criterion out of stored area base units, generating at least one area base units join, selecting at least one selected area base units join of said at least one area base units join such that a combination of join geographical areas of said at least one selected area base units join covers said slice geographical area, and combining said at least one selected area base units join as a network resource combination.