The DVD standard does not support what you are trying to do. All you have available is to start a timeline at a particular chapter point. The timeline will ALWAYS play to the end unless th euser presses the menu button.

Your best option is to export each 'chapter' as a different asset, import the set and create a timeline in Encore for each clip. You then have the control you want.

Do not be tempted to create upteen timelines in Encore for the same asset and clip the start/end points. You will end up (I think) incluiding the full asset on your DVD for each use rather than just include it once.

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