if i understand you want to have your wireless users should get IP from a specific VLAN and you are looking for place on the controller which helps you achieve it
ZD GUI --> configure --> WLANs --> Select WLAN ---> Edit -- Advanced settings --> Access VLAN.
access VLAN is where you need to enter VLAN ID from users will get IP from.
Make sure you trunk the port to which AP connects on the switch.