Currently Appearance Editor support for CC3 Base characters is not available so you can't add body hair as you can with CC1 Base characters.
However CC3 base characters will be supported by the Appearance Editor in the 3.1 update which is tentatively scheduled for around the end of Q1 2019.
For now you can only add body hair to the Elite characters by editing the texture maps themselves in an image editor.
Peter
Forum Administrator
www.reallusion.com