When you add software to an existing server, you are adding a new role for the server.
Adding software to a server is useful in the following scenarios:
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You have a new set of data that you want to back up. For example, SQL Server databases. 
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You want to reduce the load on other servers. 
Procedure
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From the navigation pane, go to Manage > Servers. The Servers page appears. 
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In the Actions column for the server, click the action button  , and then click Add software. , and then click Add software.The Add software dialog box appears. 
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From the Select Package(s) for list, select each software package to install on the server, and then click OK. 
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To allow the servers to reboot if required during installation, move the Reboot if required toggle key to the right. 
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To receive an email notification about the job completion status, select the When the job completes, notify me via email check box. 
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Click Install.