Yes you can. Go to http://www.soapcalc.com and just plug in Coconut (fractionated) instead of the regular coconut. Just for laughs, I would keep the total under 25% of your total weight of oils. Coconut is pretty harsh stuff.
I was going to keep it under 20%. I was getting nervous because I couldn't find any place other than the soap cal that has Frac. Coconut oil in CP. I don't know if anyone has tried it and I didn't want to ruin oils.