Lifecycle Services Orchestration (LSO) architecture for Metro Ethernet Services was introduced by MEF. In the LSO architecture, the ALLEGRO interface was defined for dynamic service control between customer and Service Provider while the INTERLUDE interface was defined between Orchestrators of two Operators to initiate a technical operation or dynamic service control. In order to address dynamic control of services supported by networks of multiple operators over ALLEGRO and INTERLUDE interfaces, Elastic E-Line Service was introduced by the author in MEF. In addition, Cloud Services Architecture was introduced as an architectural framework for virtual services by the author. In this paper, we describe LSO architecture and Elastic E-Line Service concept, and interactions between various LSO entities for dynamic service provisioning. After that, we describe Cloud Services Architecture and dynamic modifications of Elastic Cloud Services over ALLEGRO and INTERLUDE interfaces, for the first time.