You can create a server group and manually add servers to the group. The server group remains the same until you add or delete servers.
Procedure
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From the navigation pane, go to Manage > Server groups. The Server groups page appears. 
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In the upper-right corner of the page, click Add server group. The Add server group page appears. 
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In the Name box, enter a name for the server group. 
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Select Manual Association. 
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In the Servers list, select the servers that you want to associate with the server group. Tips - 
Use the search box to filter the servers by name. 
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To show only the servers that you selected in the Servers list, select the Show selected check box. 
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You can also associate servers to a server group by using the Create server group option on the Servers listing page. 
 
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Click Save.