It can occur that you put an annotation on the wrong tier. If the start and end time of the annotation unit are correct, you can move the complete annotation to a different tier by pressing and holding ALT and clicking and dragging the annotation with the mouse. This feature currently only works with time based annotations.
Dependent or child annotations will only be moved along with the parent annotation unit if it is clear from the tier names to which tier they should be moved. (from tx@A to tx@B for example). If this is not clear, the dependent annotations might be lost. A safer way to move annotations is to use the copy and paste annotation groups. See Section 2.16.4