When you have three layers of the biggest tier of the wedding cake assembled, so that there are two layers of raspberry preserves, fresh raspberries, and cream cheese icing between each layer, then you can place dollops of icing on the top of the assembled cake.
Again using your offset spatula, smooth the icing down over the top and the sides of the cake. This is called your "crumb layer" of icing as it will catch all of the crumbs and seal them in. Place the tier in the refrigerator to firm up for 20 to 30 minutes, while you assemble the other tiers.
Repeat the above process with each of the other two tiers, slicing each into three layers, placing on corresponding size cardboard round, and filling each layer with raspberry preserves and fresh raspberries before frosting with cream cheese icing.


