1. A method, comprising: configuring a plurality of network domains of a host communications network (HCN), wherein each network domain provides a network configuration for a virtual communications network (VCN) provisioned within the HCN for an enterprise customer of the HCN, which provides a virtual communications subnetwork of the HCN from which the enterprise customer can provision communications services for a communications services business, and wherein the HCN provides bandwidth over outroute channels and inroute channels of the HCN for the VCNs; configuring a plurality of outroute capacity partitions via one or more of the outroute channels of the HCN and configuring a plurality of inroute capacity partitions via one or more inroute groups of the HCN, wherein each inroute group includes one or more of the inroute channels of the HCN, and wherein each outroute capacity partition supports a respective level of outroute bandwidth and each inroute capacity partition supports a respective level of inroute bandwidth; allocating one or more of the outroute capacity partitions and one or more of the inroute capacity partitions to a first VCN to provision a designated level of the outroute bandwidth and a designated level of the inroute bandwidth to the first VCN; and configuring one or more operator classifications within the network domain associated with the first VCN, wherein each operator classification specifies a set of network operator capabilities and permissions allocated to one or more virtual network operators assigned to that classification; and wherein the designated level of outroute bandwidth provisioned to the first VCN via the allocated one or more outroute capacity partitions is provisioned as a level of bandwidth in megabits-per-second (Mbps), and the allocated one or more outroute capacity partitions supports a portion of overall outroute spectrum of the HCN, and wherein the designated level of inroute bandwidth provisioned to the first VCN via the allocated one or more inroute capacity partitions is provisioned as a level of bandwidth in megabits-per-second (Mbps), and the allocated one or more inroute capacity partitions supports a portion of overall inroute spectrum of the HCN.