Add or Delete Layer
Flash CS3 Tutorial
How to Add and Delete a Flash Layer
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 or Cmd/Shift/n (PC-Ctrl/Shift/n). 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.