Ah, you mean this tutorial?
http://www.insimenator.org/showthread.php?t=52230The only thing you need before using this tutorial is to clone a maxis recolor with bodyshop(one you want to convert

)and then use this tutorial:
Damm.....i cant find the right tutorial........thought it came from rose her site but i forgot....
This one you can use also till the part were you going to export the gmdc, you have to switch to TMO's tutorial then
http://nene.modthesims2.com/printthread.php?t=248699