How is the clone center actually used??

The Clone Centre is as it states.  It replicates the current player into your save.  I have never tried it so I do not know if it actually works as intended.  Give it a go, and see what happens.  Before you do, backup your save first.

you also dont need/have to clone everything from one player to another you can be selective as to what features are cloned by ticking the box in each option you do not want cloned here I selected 

age and name cloning ashley williams with joe rodon

 

Rodon uncloned

 

 

cloned