You can create a new system under NetWeaver portal and also add an Alias of the system.
Step 1 − To create a system, you have to login to the portal as an Administrator.
Step 2 − In the top level navigation bar, go to System Administration → System Configuration → System Landscape, as shown in the following screenshot.
Step 3 − Next, go to Portal Content. Right-click Portal Content and select New System as shown in the following screenshot.
Step 4 − Select JDBC System, and click Next.
Step 5 − Enter the System Name and System ID properties as New System → Next → Finish.