You can create and delete server instances without an existing node agent using a node agent placeholder. The node agent placeholder is created on the Domain Administration Server (DAS) before the node agent itself is created on the node agent’s local system.
For information on creating a node agent placeholder, see To Create a Node Agent Placeholder
Once you’ve created a placeholder node agent, use it to create instances in the domain. However, before starting the instances you must create and start the actual node agent locally on the machine where the instances will reside using the asadmin command. See Creating a Node Agent and Starting a Node Agent