To split a model :
- If you draw using an engineering CAD soft : piece of cake.
- There has been a tuto on that topic for zbrush made for the form1 users.
- Other than that, it is no rocket science : cut at plane, paste or remove a cone. You could do it in meshmixer.

I have a 1412 : it's great, I posted a few things on the dedicated thread of this forum.