Hi there jerlyn:
How tall are you planning on making this tree?
Based on this, there are several things you can do.
1. Internal support for the tree; buy yourself a 1/2 inch flange. You can find this at your local hardware store. It's the base for your structure. According to the hieght of your cake a couple of 1/2 inch galvanized (metal) pipes, and the corresponding couplings to attach and secure your structure. You would then cut a hole through each cake and cake board and then sit it through the pipe that has been wrapped in saran wrap (so the metal doesn't come in contact with the cake).
2. for the branches; you can use wire and melted chocolate. place a 24 gauge wire on wax paper that has been previously greased, melt some choclate in microwave and with a piping bag squirt chocoalte over the wire in different directions to simulate branches. Let this set. When completely set turn it over and do the same for the other side adding branches as you go. You can also pipe some chocoalte in this form without the wire and glue to the bigger branches with more chocolate. Add the leaves at the end.
sorry this is so long and maybe my explanation is a little complicated but this is how I would do it.
maybe someone else may have a better idea.
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