You cannot split the IAP- 92/93 into two bands. The preferred band for IAP 92/93 is by default 2.4GHz but it can be changed via a global setting.
1. Log into the Web UI of the IAP
2. Click on Settings and under the "Preferred band" select 5GHz to make the IAP 92/93 work on 5 GHz.
3. APs will have to be rebooted in order for the change to take effect.
Hope this answers your question.