We have a series of 20 tasks created with each Opportunity that guide us through the sales process ensuring all steps are completed when Sales are successful.

We have Opportunities that ultimately are not successful but we have created the 20 tasks for each. The status of all these tasks is Not Started and the Assigned To: field is systematically "required" on the form (it is grayed out so I cannot uncheck it).

I am looking for a mechanism that allows us to continue to utilize standard NetSuite functionality around marking tasks Complete but still allows me to treat the tasks as Cancelled. Since the Opportunity is lost the tasks are in effect cancelled. Cancelled is not a delivered task status and we don't want these tasks to continue to appear in the Assignee's worklist.