Provisioning section is a great way to manage these. If you need to do so on a specific device and you are running a later version of FortiManager 5.0.x (which you should), you can do so in the Device tab, under the dashboard using the " Menu" drill down.
If you don' t see the option, you may have to turn it on. You can go to Menu -> Customize to turn it on for this particular FGT, or you can right click " Managed FortiGates -> Customize Device Tabs" to change it for all the FGT' s.
Hope this helps. Cheers!
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Sean Toomey, CISSP FCNSP
Consulting Security Engineer (CSE)
FORTINET— High Performance Network Security