Its recommended to use separate Admin interface for GUI access from network. You may find default topology with B@AP configuration for switching traffic locally at AP. You can make use of that topology. Extreme doesn't use the term "trunk". Create one topology for each VLAN IDs and assign it to esa0/1/2 or 3. Assume topology as a VLAN with an egress port. While creating B@AP topology assigning controller's physical interface is not needed as VLAN are going to be at AP.