The right-hand side of the Timeline dialog is the Actions menu list:

This list is the same as the list found in the Actions tab of an object.

To add an action to the timetable: Click on the menu heading in the left-hand column (e.g. General) – the actions in the menu are automatically displayed in the right-hand column.

To add an action to the timeline: Double-click on the name of the action. The icon will appear on the Timeline Graph and a popup box of the actions options is displayed.

Actions can be moved to new positions on the Timeline Graph by dragging them.

Using the Timeline