If its a fixed list, then your job action would be:
BEGIN
DBMS_SCHEDULER.stop_job(''JOB1'',TRUE);
DBMS_SCHEDULER.stop_job(''JOB2'',TRUE);
DBMS_SCHEDULER.stop_job(''JOB3'',TRUE);
..
END;
or if it is something based on a criteria it could be:
BEGIN
for i in (select job_name from user_scheduler_jobs where ... )
loop
DBMS_SCHEDULER.stop_job(i.job_name,TRUE);
end loop;
end;