Hi Veronica… I am not quite sure what you mean. A lot will depend on your size and design. I sculpted my rabbit cake… I placed a 2nd cake board (cut to size) between the head and the body, and dowelled for support, as you normally would with a tiered cake. The cake was masked in ganache, prior to adding fondant layers:
http://cakesdecor.com/cakes/113925-mythical-flabbit
I hope this helps? If not, maybe a few more clues on your design, will allow as to help you more?
Julez, https://www.facebook.com/pages/Allways-Cakes/450634018350115?ref=hl