I just draw a circle (square) using the pan and go around it with a razor knife. Then cover it with contact paper or fancy foil. Once there is icing on the cake you won't be able to see the board.
once i get the cake on the board i cut it with sharp scissors all around. right under the edge of the cake then cover the cake in buttercream and cover with fondant. i tuck in the fondant into the cake board and then put that one on another cake board with what ever theme cover your are doing.
hope that helps
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