Google is your friend for downloading CR2 editor or you can download it from my downloads page at my website.
As you open the CR2 (with cr2 editor) you have a top and a bottom half, whatever you do to the top must be done to the bottom. Each body part (lThigh, rShldr, etc) is a bone. The rule of thumb is you always keep the hip, go to your bone that is your obj and then add 1 bone past it. Lets say I have a conforming sleeve that goes from the Shldr to the ForeArm...I would keep the hip, abdomen, chest, head (sometimes things get wonky without head bones), Collar, Shldr, ForeArm, Hand. The Hand is the 1 bone past the end point.
Get it?

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