The policies provide the flexibility and autonomy necessary to regulate an environment, determining their behaviour according to a set of rules. They allow dynamically specifying behaviour of a system, which can be easily modified without the need for substantial changes of the structure or implementation environment. The policy-based systems management requires an appropriate policy specification. An ontology-based policy specification simplifies the description and facilitates the analysis and reuse across various systems of complex environments. In this paper, we present a policy-based approach to manage the group organizational structure (which establishes how the groupwork will be organized) into collaborative applications. This policy defines an organizational structure that allows coordinate the interaction of the users with shared resources and with other users, and controls the users access to the collaborative application.