Hi
You can created multiple SSID on a AP, now you need to configure the VLANs to be used on the AP and configure a trunk between the AP and the switch. Also you need to configure a native vlan between these devices and create it on the AP.
The native vlan will not be assigned to any SSID.
Once you have created the vlans on the AP you can begin to create the SSID as usual and associate them to the VLAN specifically.
Please check these links:
http://www.cisco.com/c/en/us/td/docs/wireless/access_point/12-3_7_JA/configuration/guide/i1237sc/s37ssid.html
https://supportforums.cisco.com/document/55561/multiple-ssid-multiple-vlans-configuration-example-cisco-aironet-aps
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