You can add bookmarks to your timeline to separate the timeline into sections. These bookmarks can later be exported as DVD chapters.
To add a bookmark, right-click the timeline at the point you wish to add a bookmark. Choose "Set Bookmark" from the drop-down menu. The Edit Bookmark dialog will open. Enter the bookmark's name in the box and choose the color you would like your bookmark to be by clicking the color sample, then click OK.
The bookmark will appear on the timeline. To check the name of a bookmark, move your mouse over it and wait until the tooltip appears.
To remove a bookmark, right-click it and select "Remove Bookmark".