I find that difficult as well, I have only chosen to do two layers of sheet cakes and filled them that way. It makes for a nice tall sheet cake and much easier than torting a sheet cake.
I will watch for tips on torting a sheet cake without breaking it. ![]()
I torte my sheet cakes with the Wilton gadget -- basically a long wire attached to a handle. It works well and gives you even layers. I slip a thin/flat metal board in between the cake to remove the top layer. It's the same as using a cookie sheet except that my metal board is alot thinner so it's easier to shove under the top layer.
This might help:
http://www.cakecentral.com/cake-decorating-ftopict-36839-sheetcake.html+filling
http://www.cakecentral.com/cake-decorating-ftopict-31115-sheetcake.html+filling
http://www.cakecentral.com/cake-decorating-ftopict-31522-sheetcake.html+filling
http://www.cakecentral.com/cake-decorating-ftopict-51950-torting.html
http://www.cakecentral.com/cake-decorating-ftopict-46685-torting.html
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