No section to add branch points?

I am trying to create an animation montage, but there are only 3 lines in the section. There is no 4th line to add branch points in. How can I add a branch point to the montage without the line for it?

well, as far as I know the workflow to add Branching point to your montage is through Notifier
here is the steps

1-By Right click on notifier bar and ADD notify then New notify

2- Then select the new notify and go to detail bar and modify it as in the picture.

3- then You will be able to call it in the EventGraph as u can see.

Best of luck

Interesting. Thanks!