Hi, Vijayabalaji Sekar.
On "Configuration" > "Manage Authentication" you can add more than one LDAP backends (with "Add source LDAP server" button). Keep in mind you also will need to add same server as additional source server for Cache Refresh.
We actually do have a custom script that allows to do the same, [here](https://github.com/GluuFederation/oxAuth/tree/master/Server/integrations/basic.multi_auth_conf).
Hope this helps.