SmartMonitor settings contains a list of monitors that should be added if discovered. This setting is global. If you'd like to change this during your discovery of a new set of servers, you can modify SmartMonitor settings before you enter the monitor scanning step.
So to summarize:
1) Specify range of IPs for new servers to be added
2) Run device discovery. On results screen, you can change SmartMonitor settings to the desired set of monitors
3) Go to next step in discovery, which will discover and add monitors based on SmartMonitor settings.