Multiwan & Specific WAN routing

Hi,

Good day! Im new with mikrotik and just finished setting up my load balance ( https://aacable.wordpress.com/tag/mikrotik-howto-combine-multiple-wan-links/ ).

My home and office are on the same network and I wanted to force the computers on my office (Static IP) to a specific WAN and the rest to the load balance connection. I followed this guides http://forum.mikrotik.com/t/forcing-single-ip-to-use-specific-wan/85520/1 and http://stackoverflow.com/questions/17514261/mikrotik-route-all-traffics-of-particular-local-ip-to-defined-gateway to no success. How do I configure this? I was able to do this with pfsense with failover but its much harder for me to translate it to mikrotik.

Thanks,
Karl