Mixer Sections

How are instruments assigned to different sections in the mixer? I'm working on a piece and have "wwinds" which includes only an English Horn at the moment, and "winds" which includes Flute, Oboe, Clarinet, Bass Clarinet, and Bassoon. Why is the English Horn in its own group? Can I reassign it?
michael
Check out my classical music:
http://michaelmyers08.wix.com/imso
michael
Check out my classical music:
http://michaelmyers08.wix.com/imso