altq merge

a simple PRIQ example:

altq on $ext_if priq bandwidth 10Mb
    queue { pri-low pri-med pri-high }
queue pri-low priority 0
queue pri-med priority 1 priq(default)
queue pri-high priority 2

pass out on $ext_if proto tcp from any to any port ssh
    keep state queue(pri-med, pri-high)
pass out on $ext_if proto tcp from any to any port www
    keep state queue pri-med
pass in  on $ext_if proto tcp from any to any port www
    keep state queue pri-low

This can be found at /usr/share/pf/queue3