You can add a Secure Agent to an existing Secure Agent group when you install the agent. To add a Secure Agent to an existing group, add the InfaAgent.GroupName property to the infaagent.ini file before you register the agent.
Install the Secure Agent.
On Windows, when you are prompted to register the agent, open Windows Services and stop the agent.
On Linux, when the installation program finishes, do not start the agent.