I am making a 3 tiered cake 6,10,14. I have used 2 masonite boards as my base. They have been glued together. So I will be using cardboard circles in between that my cakes will be sitting on. They are wrapped in Glad Press and Seal. Do I ned to use 2 boards under my 10 and 6 in cakes? Am I making sense? Masonite 14inch cake circle on top of that 14 in. cake. Then 10 inch cake circle then 10 inch cake. Then 6 inch cake circle on top of that 6 inch cake.

You only need wrapped cardboard circles under your 10 and 6 inch cakes. The 14 inch cake can be placed directly on the masonite base (unless it's a fondant covered base in which you've cut a hole for the cake to fit into). You may double up the board under the 10 inch if you want, but I don't think you have to. I've never had a problem using just one board.