In Windows, an administrator can de-activate a DHCP scope. When the scope is inactive, clients cannot receive any addresses from it. Address Manager does not import inactive scopes: if you want to import a scope, you must activate it first.
You cannot import data from a Managed Windows server after you switch it to Read-Write mode in Address Manager. Consequently, if you need to manage a scope that is inactive on a Managed Windows server you must create the corresponding network in Address Manager, assign it a DHCP Master deployment role, and then deploy it.
Deploying a network to a Managed Windows server that includes the inactive scope will activate that scope. BlueCat Networks recommends that you create such a scope only if you intend to activate it.