As far as I understand you would have to either make a seperate scene for each one, OR you could most likely do frame 1-200 (just throwing numbers out...no idea how many frames a walk cycle would actualy take.) and then do like 201-400 for a different cycle...Then when you batch render it just choose the frames of which ever cycle you are trying to render.

I have not gotten into Animation yet though so that may be wrong, or a bad way to do it.