Running queries against multiple servers I want to use a Central Management Server, with a server group underneith, to run management queries against multiple server.

I know how to run a query against the whole group through SSMS, but I want to schedule queries to run through server agent.

How do I do this?
What you're looking for it sounds like is the Target Servers of a job. You can add your servers to this portion so that the job is run against your desired servers. 

BOL documentation on Target Servers: http://msdn.microsoft.com/en-us/library/ms189553.aspx