Add or Delete Layer
Flash CS4 Tutorial
How to Add and Delete Flash Layers
To add or delete a layer, select the layer in the layer panel, then click the appropriate icon.
Make sure the timeline/layers panel is open by choosing Window > Timeline.
To add a layer, click the Insert Layer icon. A new layer is added above the currently selected layer.
To remove a layer, select a layer, then click the Delete Layer icon.
You can also insert and delete layers by right clicking one of the layer names in the layer panel and choosing either Insert Layer or Delete Layer from the menu.