The dialog allows you to change the basic properties of fixed section layers.
Display
Display the corresponding layer.
Volumes
Include the layer in the volumes.
Include in merged surface
Include the layer in the merged surface. The merged surface is a composite surface formed as layers are processed sequentially from top down.
Extend and Clip
This feature generally applies when a fixed section is moved horizontally or verically by an alignment change. The last leg in the fixed section is automatically extended until it intersects ground and/or clipped when it cross ground.
If checked, stripping will be applied, if it is enabled (see Edit | Assign Paramaters by Range | Site Prep). Stripping will also be updated if the fixed section is moved.