you might be able to accomplish that under agent manager\assets\manage assets\add assets. You will need to create a file with the names of the CG agents. The hosts list file must contain one of the following columns: Hostname or Addresses.
The columns must be tab-delimited.
In the Addresses column, you can separate multiple IP addresses with a comma

I would start out creating a list with maybe 3 agents and see how that works.

I find easy method...that add these asset on agent manager.

then run [reconfigure agent]...type auth information....then it will try to connect these agent and re-register again..

I had tested 2 agent , and work fine.

Wencheng