A bit more explanation. Kontakt has a bunch of internal routing but here's how I think of the parts we're working with.
Kontakt has K5 mixer channels and K5 plugin outputs. The mixer channels are the faders in the output section. So:
K5Mixer -- 1/2 3/4 5/6 7/8 etc...
plugin outs-- 1/2 3/4 5/6 7/8 etc...
Once you have an instrument/kit piece/whatever routed to a K5 mixer channel you can then route that mixer channel to whatever plugin output you want, and then use that plugin output as an input on a Sonar track.
The idea is that I can take, for example, a snare drum and route it to K5mixer channel 1/2 and a kick and route it to K5mixer channel 3/4 and use the K5mixer channel fx inserts to place effects on the snare and kick separately. Once I've done that I can route those mixer channels to one/some/all plugin outputs. So I could sum those K5 mixer channels to a single plugin output (and thus one Sonar track) or have them go to separate plugin outputs (and thus separate Sonar tracks). The reason mixer channels are seperated from plugin outputs is so I can treat the K5mixer channels individually and have flexible routing from there to one or more plugin outputs.
Hope that helps.
Dean