Hi, I also have the same question. I have 4 SSID's and 3 IAP.
Example:
Customer office have 4 SSID's which are "Guest", "Employee full access", "Employee intranet access" and "VIP". 3 Different location of IAP.
Location A only need SSID "VIP" and "Employee full access"
Location B need "VIP", "Guest" and "Employee full access"
Location C need "VIP", "Employee intranet access" and "Employee full access"