Alter CC of tattoo?

For moving the tattoo i would just export the texture and edit it in an editing program! here is a link to a template of the body textures, it might be helpful to know where you place it on the body  just don't forget to remove it before importing back the tattoo to the package!

Regarding the overlays, here is a sort layer list. Sort layers are what decides which textures show over and under other textures. This can be changed in the warehouse tab of the package, choose a "cas part" and scroll down to "sort layer".

Hope this helps!