We have installed primary server and also we have installed the base software in secondary server To make both the server as redundant,we have opened the system configuration console and searched the secondary server,but we could not able to see the secondary server.
A piece of info lacking here is system version? Normally in version 6, you perform pre-installation activities (Windows preparation, NIC configuration, adding the domain etc). Then you run the Node Preparation (install 800xA media), I guess this is were you are...
All this is described in the Installation, Update and Upgrade Getting Started manual (2PAA111708).
If this is done correctly, it should be possible from the primary aspect server, to perform "Add Node" from the SCC's System Nodes Tab.