Combing, in general, is going to damage the fibers. Depending on the style and how the cap is constructed will make a difference in how to add body to the top of a style.
If there is permatease (anything without a monofilament top) you can use your fingers to fluff the permatease and get some good body going in there that is going to last all day. Another trick I use to add body and height to my 'dos is to dry them upside down.
I hang them on a hanger on my shower rod or a suction-cup hanger on the shower wall from the tag at the nape of the cap. This helps direct the hairs up and keeps the style from looking too flat. Finally, some synthetic safe gel or creme at the roots will help add body without needing to backcomb the style.