Hi,
You can provide IP address of that device in the first discovery task. In the next discovery task you can give a range. For example if you provide 192.160.10.2 in the first discovery task. You can give 192.160.10.1-3 in the next discover task.
Another way:
In the first discovery task provide IP address. For the second discovery provide hostname of the system.
Hope this helps!
Lakshmi.