Separate IT incidents from other department

We are just about to implement ServiceDesk 7.5 and are still using 6.. One of our problems we have always had is seperating our Facilities department tickets from our IT department. This is because our managers need to run reports to generate metrics for our IT tickets but need to omit data from facilities tickets.

Can someone suggest what the best way would be to accomplish this in 7.5? Should we simply use classifications for separating these incidents? If so, would we just create an incident template and specify the classification within?

Thank you for any guidance you can provide.

Dustin @ Jacobs Technology