In spool i want to know in a particular class what jobs are running.
I want to know this information ,so that i can submit my jobs in a class which is free.
I'm not sure that we have something like, which will show all the jobs running in particular class.
But if your requirement is to find out which class is free definetely you can check that.
You should use SDSF PRIMARY OPTION menu INIT. You can check both the STATUS and CLASSes to find out the free CLASS. Make sure that STATUS must not be drained for that particular class.