Traffic Priority From On Source Port

Hi Tech Team,

I am new to the Mikrotik world. I am very impressed with OS. I am working for a client who uses MT for a project where I only need to use MTs. I need a guide and your help as I have a scenario where a host will be generating all sort of traffic and critical traffic will be generated from a particular source port from the same host 192.168.x.x and as the bandwidth pipe is very narrow therefore I will need to set up Queuetree where I will need to reserve bandwidth from this source port and always give priority to this source port-5272. I know how to give priority based on source IP Address but as i said there will be all type traffic from this host and traffic from the certain port will need to get priority at all time. There are two WAN links and regardless which link is active that source port traffic should get priority at all time and if possible i need to reserve the bandwidth against the source port. Any help/guide will be highly appreciated.