Hi Dale,
We have a bunch of CSV importers, if you can get your data into a CSV format then you should be able to get everything into Service Desk.
To import Incidents see this support article:
http://support.citrixonline.com/en_US/GoToAssistServiceDesk/help_files/G2ASD060011?title=Import+Mult...To import Customers see this support article:
http://support.citrixonline.com/en_US/GoToAssistServiceDesk/help_files/G2ASD020005?title=Manage+Cust...If there's any other information you need to get into Service Desk let me know, and I'll see what we can do for you.