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You can change the elevation of any intersection of gridlines from the elevation of the current level. Select the gridpoint by pressing the Grid button then clicking the intersection. The two gridlines will appear in red. The Gridpoint Elevation field in the Data Bar will become active, and you can type in the new elevation in one of two ways.
Enter the absolute elevation of the gridpoint, or enter the offset of the gridpoint from the elevation of the current level prefaced by a + or -. Then press Enter, and you will be asked to confirm the change.
When a gridpoint which is already at a different elevation from the current level is selected, its offset will be displayed.