how to stop all instances of a workflow in bulk

How to stop bulk workflow like all PO workflow's etc........

UPDATE MAXIMO.WFINSTANCE SET ACTIVE = 0

WHERE OWNERTABLE = 'PO' and active=1

UPDATE MAXIMO.WFASSIGNMENT SET ASSIGNSTATUS = 'INACTIVE'

WHERE OWNERTABLE = 'PO'  and ASSIGNSTATUS = 'INACTIVE'

 

UPDATE MAXIMO.WFCALLSTACK SET ACTIVE = 0

WHERE ACTIVE=1 AND WFID IN (SELECT WFID FROM  MAXIMO.WFINSTANCE WHERE ACTIVE = 1

AND OWNERTABLE = 'PO') AND PROCESSNAME LIKE '%PO%'

another way is escalation using oob action class (recommended way) check IBM notes...