Hi Prasad,
Hope you are doing good.
Do make sure that you are on the latest NWDS and the latest patch level.
Then to import the WAR file, choose File → Import and navigate to the default logon UI application under the following path:
<ASJava_Installation>/j2ee/cluster/apps/sap.com/com.sap.security.core.logon/servlet_jsp/logon_ui_resources/sap.com~tc~sec~ume~logon~ui.war
Thank you and have a nice day :).
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Kind Regards,
Hemanth
SAP AGS