How to assign a VLAN to a client using the client MAC address

[QuentinR]

I have a laptop connected to the FortiSwitch VLAN from a WAP and I would like to isolate this laptop to its own VLAN. I have created a sub VLAN under the physical lan1 interface (the same interface where the FortiSwitch VLAN is located) but I cannot figure out how to set this client to join the new isolated VLAN.

Is there a way to do this by using the laptops WLAN and LAN MAC addresses?

I am using a FortiGate 51E firmware: v5.4.3,build1111 (GA)