Michael,
I would assume a web service would be possible to accomplish this, and possibly a custom component or two. My advice would be to contact a consultant to look into this. You might consider getting some one-on-one assistance from Symantec's Consulting Services Group or one of Symantec's Partners that provide consulting services for Workflow/ServiceDesk. For more information about Symantec's Consulting Services Group, call 800-721-3934 or visit them online at http://www.symantec.com/business/services/consulting_services.jsp
If Symantec Consulting Services or one of Symantec's Partners has already been involved with your project development, or modification or customization of a Workflow or ServiceDesk project, we recommend re-engaging Consulting Services to provide continued support.