1. Select 'Edit/Interpolate Sections'
option from Modify menu Modify Section window will appear.
2. In Modify Section window select the layer from the drop down box you want to edit and select a section from the dropdown box then the section can be viewed in a preview window.
you can edit data only from layer 1 to layer 20.
3. Now select 'Edit '
option to see the grips for editing then place the mouse pointer on the grip and then drag the mouse to the as per the requirement.
4. After editing click on 'Save Current'
button to save the drawing.
Once all section editing is completed, then click on 'SaveAll'
button to save all changes made.