Mass Staff Assignments for CR Prospect Resources

In Contributor Relations, the Mass Staff Assignments page (Contributor Relations > Prospect Management > Prospect Resources > Mass Assignments > Mass Staff Assignments) requires a start date.  How/where can we do a similar process to set an end date when a staff resource leaves the university and a new staff will be assigned?  Ideally, there would be a way to do this as a mass process based on the staff resource assigned.

Can anyone provide any thoughts on how we can accomplish this?  We currently have a large group of prospects assigned to a staff resource that is no longer available.

Thanks,

Janelle