http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
Yup use the above reference to help you setup a structure.
Use AP-WISP quickset for the hapac acting as an AP switch to get you started and then modifications after that are MINIMAL
-use a bridge
-create any vlans required to match vlan IDs used on the main router
-config wifi as required
done