When doing stacked construction (for a wedding cake - 14", 10" and 6" tiers) do you put a seperate cake board in between tiers? If I have the 14" base and the 10" tier going on it (the 10" cake is on a 10" board already) - do you put an 8" cake board in between the two for added support? 
I have each cake on it's own cake board. The bottom cake is on a larger than the cake board (usually showing about 2 inches of the board) but the other two layers (or more if you are doing them) have boards under them that are about the same size as the cake itself or slightly smaller. Then I put dowels in the layer underneath to support the cake and stack it. There is probably a link somewhere on this site that shows how to stack the cakes. I know there is a section in the back of every wilton yearbook that shows this.
The support comes from the dowels, not the boards. You just needs the boards under the cakes so you can move them and so there's something to sit on the dowels.
Yes, that is true, but for those just starting out, that may be confusing. You need the boards to go on top of the dowels, or else the cake will have nothing to support it.
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