When load an animated x file is there a function or method to select specific frames to shuffle through animations? For example if I have 0-100 walking and 101-200 running how do I select the ranges when I want.

I know with x files you can use animation sets. But How do you assign animations to sets in the model editor? Im using Blender. I also heard its easier to do it the first way I mentioned but is that done in Blender or in my program with directx?