Are you asking in general or in an automated way? I think in general, all you need to do is assign the specific user the "admin" role from a user with the required permissions (another admin I'd wager). You can do this in Settings -> Access Controls -> Users -> "Assign to roles" -> admin, or recreate the user in a way that you prefer. More info can be found on the docs here https://docs.splunk.com/Documentation/Splunk/8.0.1/Admin/Aboutusersandroles.
Are you asking in general or in an automated way? I think in general, all you need to do is assign the specific user the "admin" role from a user with the required permissions (another admin I'd wager). You can do this in Settings -> Access Controls -> Users -> "Assign to roles" -> admin, or recreate the user in a way that you prefer. More info can be found on the docs here https://docs.splunk.com/Documentation/Splunk/8.0.1/Admin/Aboutusersandroles.
