Apple Motion 3 - Manual (Page 365)

Chapter 4 Using the Timeline 365
To delete all project markers only:
1 Choose Edit > Deselect All (or press Command-Shift-A).
2 Choose Mark > Markers > Delete All Markers.
To delete all object markers, do one of the following:
m Select the group or layer containing the markers you want to delete, then choose
Mark > Markers > Delete All Markers.
m Control-click the gray marker bar above the ruler in the Timeline, then choose Delete
All Markers from the shortcut menu.
Editing Marker Information
You can edit the information for a marker, including its name, starting frame, duration,
and color. You can also add comments to the marker. Comments show up as a tooltip
when the pointer is paused over the marker.
To edit marker information:
1 Open the Edit Marker dialog by doing one of the following:
 Double-click a marker to display the Edit Marker dialog.
 Choose Edit > Markers > Edit.
 Control-click the Marker, then choose Edit Markers from the shortcut menu.
Notes added in the Comments field appear as tooltips when the pointer is over the
marker.
2 Type a name in Name field.
3 Type a number in the Start field.
The marker moves to the frame number you enter.
4 Type a value in the Duration field to specify the range of frames for the marker.