@afzalbaig - Unfortunately @manishiiita has given you advice which applies to VA 7.x not VA 8.3. SAS Management Console isn't available under SAS Viya, the platform VA 8.3 runs on. Unfortunately we don't have VA 8.3 so I'd only be able to help by searching documentation.
I suggest you start reading up on the Viya documentation regarding administration: https://documentation.sas.com/?cdcId=calcdc&cdcVersion=3.4&docsetId=calchkcfg&docsetTarget=n00004saschecklist0000config.htm&locale=en
Environment Manager could be where you set up user permissions.
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