I am wanting to make one of the present cakes that are stacked three high, instead of two, so my question is, what is the best way to do that? Can I just put the bottom cake with my filling, another cake, filling and the final cake? or do I need to divide it up somewhere with a cake board and support? Thanks!

For every four inches of vertical height you must have a cake board and support system. Have to ever make a stacked/tiered cake before?