Make all selected surfaces and lines horizontal (apply a single depth value).
1. Select either the Surfaces or Lines layer in the Layers window.
2. Select one or more surface or line features in the Display window.
Selected features are listed in the Selection window.

3. Select the Make Features Horizontal command.
Menu | Model > Update Features > Make Features Horizontal |
The Make Features Horizontal (Z Value) dialog box is displayed.

4. Type a Depth value.
The name of this field will change based on the Z-axis convention setting. "Depth" is used when the Z-axis convention is positive down, "Height" when the convention is positive up. |
5. To finish, click OK.
The depth value is applied to all selected features.
