Thanks! That makes sense! Now I'd like to put a layer with sublayers into a symbol to maintain any effects that are on the sub layers. I have an action that runs, that does this with nested layers like this. I used to just let it group everything, but then found some effects were falling off. I tried the below, but it didn't work, and states that it's an illegal argument. Is there any way to acheive this?
layer = actDoc.layers.getByName('Editorial'); //get a reference to the newly created raster item
newsymbol = actDoc.symbols.add(layer); //add the raster item to the symbols