Hi Chris,
Goto monitor related jobs as explained above.You will get the list of the jobs associated to job server.Select the first job and go to down N'th and select the job(like 50th or 100th) par alley by selecting shift key and right click and select delete job.
Like how we will select(select 1st cell and go to nth cell by selecting shift key at the same time)in excel.
Regards
Zameer