Paid Memberships Pro Multisite Membership Addon GPL Overview:
Manage memberships at the network’s main site (the primary domain of the network) and provide/restrict access to subsites in the network.
How it Works
This Add On allows you to sell memberships at the main site that provide access to members-only content on a site or sites throughout the entire multisite network.
This Add On requires WordPress Multisite and Paid Memberships Pro