Simulate AP on router HW

I have a bunch of lowcost WiFi routers and I would like to use them as standalone APs.
That means multiple SSIDs with different VLANs: management VLAN (11), quest VLAN (999) and customer VLAN (222).
All of my WiFi routers are supported by LEDE.
Now I am configuring Linksys WRT320N and I am little confused how to enable all those VLANs above.

WRT320N has 4 LAN ports and 1 WAN port.
What WAN6 (see image below) represents?
How do I create all those VLAN interfaces? Do I create new custom interface (e.g. eth0.999) bridged with LAN (eth0.2) and so on? Management VLAN should be untagged. Wireless VLANs needs to be tagged.
Will VLAN work even if it is not supported by chipset?

Its because of the netifd architecture apparently: https://forum.openwrt.org/viewtopic.php?pid=320654#p320654

[quote="mdes1, post:1, topic:6066"]
How do I create all those VLAN interfaces? Do I create new custom interface (e.g. eth0.999) bridged with LAN (eth0.2)
[/quote]What about these questions?

Thanks DjiPi.