Someone asked me in the other thread how to bring a tail into CC4.
I figured I will make a complete tut with minimum steps.

If you export that character to Blender, does it keep those tail bones? (And the bone names)

Because, I could detect a sequence of bones like that if they had a logical naming structure and automatically rig them when rigifying. Could do that with potentially anything that rigify can rig e.g. extra arms, maybe even wings. If they can be exported from CC4 that is.

Yes, it does. Accessory bones structure remains intact when exporting out of CC and importing back to Blender.

Will investigate.

I created a female character in Character Creator and I need to import her into Unity. But my character comes with earrings, and I want them to be bound with bones and imported into Unity. So, I added bones to my character in Blender, but the bones I added cannot be displayed in Character Creator. How can I implement this? Thank you for your help！ 

There is no need to create extra bones for that. When you attach earrings to the the head, the bone is already created for the accessory and exported along with main armature.
If your character is Humanoid, you may convert it to accessory as well by selecting appropriate mesh.
And if bone placement is weird you may always correct it in Blender.