Selecting Multiple Timeline Bars

There are 2 ways to multiply select timeline bars.

Hold click to select
Select timebar and hold onto the click. All the right bars will be selected once you keep holding onto the click of the bar.This method only works horizontally.

Button for multiple selections
Select the bottom left button while you are editing in the timeline. You will then notice a red line once you start to click and drag across the screen. Select or circle the bars with this line. You will not be limited horizontally with this method.
Also, by selecting the green line on both ends, you may instantly edit play length of your videos, images, text instantly! This should be useful for when adjusting your video/images to your music length.