collapse the controller and do them all at once, or drag and highlight a bunch of rows and add them that way. I only add one at a time if I am picking something very odd
Expand the controller, select the channels by left clicking and dragging your mouse in the timing grid. Right click the high lighted channels, select link channels to layer. It will give you an option to skip channels and link channels. Leave the boxes unchecked, and select link. Hope this helps