I can't think how you'd do it without a shell script. Try this (not tested!)

for proc in `dsmadmc -se=xxx -id=xxx -password=xxx -tab "select '#!#!',
process_num from processes where process='Space Reclamation'" | awk '/^#!#!/
{printf("%d\n", $2)}'`
do
   dsmadmc -se=xxx -id=xxx -password=xxx -tab "cancel proc $proc"
done


Mit freundlichen Grüßen - With best regards
Serdeczne pozdrowienia - Slan agus beannacht
Paul Baines
TSM/ADSM Consultant