Hi,
Here is how you can use the Zone functionality,
Step 1 : Create SSID and map to a Zone
EX : Emp-Zone-Bld1, Contractor-Zone-Bld1, Guest-Zone-Bld2, Emp2-Zone-Bld2
Step 2 : Right click on the IAP and slect a zone accordingly
EX : IAP 1-Zone-Bld1, IAP 2-Zone-BLD1, IAP 3-Zone-Bld2 etc..
For your ref :
Mapping a Zone to a SSID :
Mapping aZone to an IAP :
Hope got some clarity, please feel free for any further clarity on this.