cant find the way to create montage branch point in 4.8.3 and 4.10

when i watching the tutorials of third person in episode.
he told me right click at bottom line to create a branch node.
but there are only 3 line in 4.8.3.

It is done as a Notify now, so in the Notifies section add a new one, then change its type to Branching Point (done in the Details tab under event).