Warlord has done a great tutorial on Color ID. If you have not looked at it, I urge you to do so (https://forum.reallusion.com/321680/Basic-Color-ID-Tutorial).
However, Color ID in CC is only available to user with the CC Essentials Pack. More correctly, only users of the CC Essentials Pack can provide custom Color ID maps. What about those of us who don't have CC Essentials Pack? Can we do Color ID too? Well, sort of...This tutorial shows how to get the benefits of Color ID (i.e. multiple CC materials per mesh) without using Color ID.
Is it much harder to use than the real Color ID? No.
Is it more tedious and repetitive? Certainly!
If you can get CC Essentials Pack then I highly recommend it, it has many features beyond Color ID which makes it worth it for most people. However, if you are on a budget and can't afford it, this tutorial provides the tedious work-around...
"We often compare ourselves to the U.S. and often they come out the best, but they only have the right to walk on the grass while we have the right to smoke it"
Lord Ashes' Original