I was able to add another server in the already existing cluster by performing the below steps in the Solution Manager Administration Tool:
* Choose the cluster of the corresponding environment in which you want to add a new Denodo server/node.
* Right-click on the cluster -> New Cluster. For more details, you can refer to the [Creating Servers](https://community.denodo.com/docs/html/browse/7.0/solution_manager/administration/servers/creating_servers/creating_servers#creating-servers) section of Solution Manager Administration Guide
* Provide the credentials of the new Denodo server.
* Save the configuration.
The new Denodo Server/node will obtain license automatically from License Manager. You can refer to the [Denodo Platform Cluster Architecture](https://community.denodo.com/kb/view/document/Denodo%20Platform%20Cluster%20Architecture?category=Best+Practices) Knowledge base article for additional information.
Hope this Helps!