use fortigate 80c has wifi controller only

We have 3 fortiwaps 223B that were controlled by our fortigate 80c however we changed our router to dell sonic wall and kept the fortiwaps. I've tried managing the aps through forticloud but it doesnt allow me to manage the waps very well. So I would like to use my fortigate to only manage the fortiwaps and no longer act as a router. Is this easy to do?