You can quickly offset a scene marker by clicking and dragging it. You can also select several scene markers and offset them together.
 How to move scene markers
How to move scene markers
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                                                                        In the timeline ruler, click and drag on the scene marker you want to move.   There are two things to note when moving scene markers: - 
                                                                                Two markers cannot have the same start time. Dragging a marker to share the start time of another marker will be blocked. 
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                                                                                You may drag scene markers to overlap with others. The selected scene marker will appear on top. In Xsheet, the scene marker behind the overlapping marker will not be visible. 
 
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 How to move several scene markers
How to move several scene markers
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                                                                        In the timeline ruler, click on the first scene marker you want to move. 
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                                                                        While holding the Shift key, click on every other scene marker you want to move to add them to the selection.  NOTE When a scene marker is selected, its outline will turn cyan, and other scene markers will become slightly darker. NOTE When a scene marker is selected, its outline will turn cyan, and other scene markers will become slightly darker.
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                                                                        Click and drag on one of the selected scene markers. 