Changing the height of multiple sectors in DB2

How do I change the height of multiple sectors simultaneously while preserving their height differences? For instance, how could I raise a large portion of a map by 16 units?

Thank you.

You can highlight the sectors also and press Shift+pgup and Ctrl+pgup each twice. Shift+pgup raises ceilings by 8 units while Ctrl+pgup raises floors by 8 units. Same goes for lowering ceilings and floors and ceilings with Ctrl+pgdown and Shift+Pgdown. Only works in Sector mode, of course.

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Also in Visual Mode you can select multiple floors/ceilings and use the scrollwheel to raise/lower them. Their height differences will be preserved as they all raise/lower by the same amount.

Great. Thanks, guys.

Is it possible to select multiple sectors of different floor/ceiling heights, and set all of their sector sizes to 128 units tall (based on each sector's floor height, for example)?