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http://forum.mikrotik.com/viewtopic.php?t=81061
Create 2 bridges one for office Other for guest
On bridge for office give IP-address example 192.168.100.1/24 and configure DHCP-server on it On bridge for guest give IP-address example 192.168.101.1/24 and configure DHCP-server on it
Nat masquerade between bridge office and WAN Nat masquerade between bridge guest and WAN
Put ether1 end AP into bridge office this is your office LAN
Make a virtual accesspoint and put these in the bridge guest same with ether2 this is your guest LAN