In this example, we want to add 3 character actions but shorten the middle action.
After adding the actions, crop the character to shorten the second action.
Right-click on the character and select Duplicate, it will be added as a new track.
Hover your mouse over the first two actions and click X to remove them
Drag the duplicated character across the timeline until it snaps on the shortened action.
You can then group the character track to easily organize it. Press the Ctrl key on your keyboard and click on the character on the track. Then Right-click on the selected track and click Create Group
That's it! you now have a shortened action.