You can use agent groups to organize and manage the agents linked to Tenable Nessus Manager. You can add an agent to more than one group, and configure scans to use these groups as targets. This will happen.
Tenable recommends that you size agent groups appropriately, particularly if you are managing scans in Tenable Nessus Manager and then importing the scan data into Tenable Security Center. You can size agent groups when you manage agents in Tenable Nessus Manager.
The more agents that you scan and include in a single agent group, the more data that the manager must process in a single batch. The size of the agent group determines the size of the .nessus file that you must import into Tenable Security Center. The .nessus file size affects hard drive space and bandwidth.
Use the following processes to create and manage agent groups: