Once a Switch layer is created, you can manually select which sublayer is visible. You can also create a switch data file that tells which sublayer to view at which frame using an external text file.
Only one of the sublayers in the Switch layer is visible at a time. If you right-click the Switch layer, a pop-up menu shows each of the available sublayers. If you select one from the list, then the selected layer becomes visible and remains visible until another sublayer is selected.
The visible sublayer can be animated, so if you select another sublayer at frame 10, then that sublayer will be visible from frame 10 onward.
Another way to control which sublayer ...