When you have a new Site, you will need to create the Site and any Accounts, Meters, Sub Meters, Virtual Meters, Channels and Supply Points.
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The Tenant Contract is under the Tenant Provider in the Tree Selector. A Tenant Provider represents the Organisation / Site Manager that is billing the Tenants and holds the Contracts and Tariffs for Tenant Billing.
If this doesn't already exist, set up new Provider using this page: Adding / Maintaining a Tenant Provider.
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